Interactive rendering slows down.

[fatherrain]

Hello
I bought a new computer. I installed a new operating system and updated all drivers including bios. I installed 3dsMax 2025 and Corona 12. I didn't install any scripts. I opened a new file and placed a very simple plane and cube. I added some simple sky lighting. I had no problems while rendering. But when I ran the interactive view, everything changed. I can hardly do anything. I can't even switch between commands. My computer is getting very bulky. It became very difficult to switch between scenes, change materials, and move objects. I did a lot of hardware testing. I did not encounter any hardware errors. I share with you my system properties and the screenshot of the scene. I communicate using Google Translate. I hope I was able to convey the problem clearly. I hope I wrote my problem in the right place. Thanks.

ASUS PROART X870E-CREATOR WIFI
AMD Ryzen 9950X
ASUS PROART-RTX4070TIS
G.Skill Trident Z5 Neo 2x32gb
Crucial T705 2TB

[fatherrain]

When I followed the instructions mentioned in the link, my problem was solved for now. I hope it doesn't continue later. A simple setting is required under Windows. If there are other performance settings for 3dsMax, I would be happy if you let me know or recommend an article for me to read.

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-force-your-laptop-to-Run-with-Graphics-Processor-vs-the-default-Integrated-Graphics-for-InfraWorks.html

[maru]

That's strange, because Corona does not use GPU in any way (only for AI denoising, but it shouldn't affect performance much and I can see that you are not using denoising). Are you getting correct scores from Corona Benchmark? https://www.chaos.com/corona/benchmark

[fatherrain]

Scored 14 193 420. The highest score on this processor is 17 479 094. What do you think?

[dzintas]

Scored 14 193 420. The highest score on this processor is 17 479 094. What do you think?

Top places usually are from overclocked cpus. They could be unstable for daily use, but good enough just to get high score.
Well yours seems a bit slow either way. Gamers nexus got all cores up to 5ghz during their testing.
Did you enabled core parking? And maybe you're being thermally limited or power limited.
Still your score aren't that bad compared to scores that go up to 5ghz.

[fatherrain]

I checked it with the Unpark CPU application. Cores are open. I set the system to high performance setting. There was no change. I am using Proart LC420 liquid cooling in the system and I just changed the paste. CPU running at 95 degrees. I want to make the most appropriate settings for Corona. Is there a guide regarding the settings I should look at in the system and hardware? That is, bios, operating system, driver, armory crate etc. Where can I learn these things that we say should not be skipped?

[dzintas]

Couple of things. If I'm not mistaken your specific cpu requires core parking to be enabled. But maybe someone has more insight on this with your specific cpu.
Other thing, if your cpu is hitting 95 degrees, and you're getting around 4.6ghz. That means your cpu is thermal throttling and there is something weird with your setup.

Going back to original topic about pc slow downs during interactive rendering. Try disabling fast preview denoising, it's usually on by default. It uses gpu, and high gpu usage can make pc sluggish.

[fatherrain]

I regret using liquid cooling. I wish I had bought a tower cooler. I will look into the thermal issue. When I disabled the GPU for interactive rendering, not much had changed. The real improvement happened when I set the high performance setting for 3dsmax in the graphics section under Windows. Before, I could not perform any operations while IR was on. My current problem is, first of all, the IR startup takes about 1 minute. Secondly, there is a slowdown when the material editor is open. No slowdown on main screen during IR. But I can't even set coronasky when ME is open. There is no problem during normal rendering.

[tatarka]

For quick test, try to run test with one stick 32gb ram.

[fatherrain]

My problem still persists. I can't work during interactive rendering. :( Please help, what could be the problem?

[Avi]

is your RAM running with its rated speed? For example: DDR5 - 6000 Mhz?

Just to confirm, single ram stick test as advised above did not solve your issue?

I would double check your ram configuration and your cooler installation according to the motherboard instructions.

[fatherrain]

Thank you for your help. I couldn't reply for a while to make sure the system was working stably. Focusing on the RAM issue solved my problem. My RAMs are 6000mhz expo. I have a problem when I open expo from the bios. There is no problem with the default settings. I don't know why expo is causing such a problem. I don't know if this problem is common with expo RAMs or if my RAMs are faulty. If anyone has information on the subject and can inform me, I would be very happy.

[maru]

So if you disable the expo option everything is fine? Are you also getting the expected performance? (e.g. from the Corona benchmark)

[fatherrain]

I was getting 14,193,420 points in the corona 10 benchmark test, now I am getting 14,232,367 points. I continue to use EXPO with it closed. When I open EXPO, the slowdown I mentioned occurs. I couldn't find the solution. I will continue like this from now on.

[Naxos]

Hi, didyou solved thios problem ?
I have exactly the same issue, and (not 100% sure) i think it started with Windows 11 24H2 upgrade...

[fatherrain]

No, I couldn't solve the problem. I use the default Ram settings via Bios. If Expo is open, there is a slowdown. Motherboard, processor, Ram are all new generation. I think these errors will be fixed in time. I will write my experiences after a few updates.

[Quest]

its happen only on ryzen and corona for a month lf solution (some ppl say on win 23h2 no bug)
p.s 9950x + expo same bug

[fatherrain]

I got used to using it without opening Expo. I'll try and update my BIOS, including the BIOS. I'll write the latest status here.

[Aram Avetisyan]

Please make sure to try with latest Corona 12 Update 1 Hotfix 1 too, there were related things addressed in it.

You can get it at: https://www.chaos.com/corona/download

[Naxos]

I'll try to go back to win11 23H2, as i did not change anything in bios / ram / expo since the update.

Also 9950X, maybe 24H2 is faulty with this CPU...

I'll let you know if i succed to go back in version, and if the bug is gone.

[fatherrain]

I don't think it's related to the Windows version. Update the bios. Keep your RAM settings as default. Don't open Expo. Try it this way and let me know the result. You also said that you have the same problem. Can you write your exact problem? Is there a lag in the scene during interactive rendering or is IR opening late?

[fatherrain]

I updated my system. bios, drivers, corona, windows etc. are all up to date. Unfortunately my problem is not solved. If Expo is on, IR slows down the system. I installed 24H2 when I got my system and have never tried 23H2. I need to format the system to test with the old version. I would be happy if someone could confirm that the problem is related to the Windows version. If anyone has this problem and runs IR without any problems with Expo open on an x870 system, I'm very curious how they did it.

ASUS PROART X870E-CREATOR WİFİ
AMD Ryzen 9950X
ASUS PROART-RTX4070TIS
G.Skill Trident Z5 Neo 2x32gb
Crucial T705 2TB

[Quest]

9950X
b650E-F
96 gb GSKILL 4800
win 24h2

same problem when expo on or any OC memory brings same problem.

[maru]

Hey guys, could you please try with Corona 12 Update 1 Hotfix 1 which was released 2 days ago and let us know here if there is any improvement?
https://www.chaos.com/corona/download

[Naxos]

So, i've updated the BIOS (Asus Tuf Gaming X670) to the second last version (last one is still beta).
And it looks like the lags are gone... At least after 5-6 mn playing with IR

I'll post here if it comes back.

PS : i've also installed Corona 13 daily build jan 10 2025, as suggested earlier
Oh, and i let rams in EXPO (6000 instead of default 4800). Windows find them @6000

Still in win11 24H2, as my rollback was expired (menu grayed out)

[fatherrain]

I didn't notice the last update. I can definitely say that there was an improvement when I updated. I don't experience any slowdown issues when Expo is open. I hope there will be no more problems. Thank you maru. So, what is the correction made and what caused the problem? Do you have any information?

[maru]

Basically, there were some improvements made to the VFB code.

[fatherrain]

I was happy too soon. Disappointment again. Corona hotfix 1 did not make any changes. I tried it on a simple scene. I thought it worked. Now I returned to work and started working. The result is disappointment. I closed the Expo. Everything returned to normal. If people other than me are experiencing this problem, I think it is not a hardware problem. Which I was afraid of at first.

I think it is related to 24H2 and I am thinking of formatting my system with 23H2. Total waste of time.

If anyone can open Expo with 23H2 and has no problems, I would be very grateful if they could at least tell me about it.

I don't know if the Corona team will hear our voice and produce a solution. I really don't know if the problem is related to Corona or not. I don't know if anyone would say that the problem is not about us. My only consolation is that at least I can do my work while Expo is closed.

ASUS PROART X870E-CREATOR WİFİ
AMD Ryzen 9950X
ASUS PROART-RTX4070TIS
G.Skill Trident Z5 Neo 2x32gb
Crucial T705 2TB

[Naxos]

Maybe you can just not use EXPO until bios / chipset driver / corona / windows 11 new release ?

Same issue here, same CPU... I did upgraded bios (not the beta, but the second last one), upgraded chipset driver, installed corona 13 daily build from jan 10 2025... and it acts very better, no more long lags / stuck PC... after one day, i just had to reboot once because of afterFX and windows explorer crashed

Oh, and i let EXPO on in bios.

[fatherrain]

I installed Bios as beta. And I made all the updates you mentioned. It worked fine for a few seconds while working on the file. Then it completely collapsed. As you said, I will wait for the new version. So are you using 23h2?

[Naxos]

I could not reverse to 23h2, so i'm still in 24h2

the only way to go back now is to reinstall full PC : not really into this now...

[maru]

Just making sure I understand this correctly:
@fatherrain - you are still experiencing slowdowns with Corona 12 Update 1 Hotfix 1 with Expo enabled. If you disable Expo, it goes back to normal.
@Naxos - you have Expo enabled and Corona 12 Update 1 Hotfix 1 works correctly for you without the lags.

Is the above correct?

[Naxos]

@Maru :
All was ok with win11 23H2, EXPO on, Corona 12.1... then i've updated to 24H2 and lags came out.
I've tried corona daily build (corona 13 daily jan 10 2025) : a little bit better for a time
i can't go back to 23H2.
Tried to update BIOS (Asus Tuf gaming X670-E plus bios 3067 (not the new beta one)
EXPO still on : it seams to be better, at least yesterday i did not had serious lags...

define lags in this issue : all is stopped for 10-15 seconds : even mouse pointer, the whole PC seams frozen, then back to normal for 5-7 seconds, and again frozen... Only when rendering or IR.
the task manager does not show anything alese than 3dsmax at 100% CPU... ram is not full, HDD / SDD not used... And... task manager also is frozen for those 10-15s

even with light scene : plane + teapot, hdri for light (same hdri i use since 10-15 years)...

[Quest]

New hotfix didnt help at all same freezzes

[maru]

@Naxos - have you tried the Hotfix 1? It's different than the daily build. There are some fixes in it specifically for these kinds of problems.
https://www.chaos.com/corona/download

[Aram Avetisyan]

New hotfix didnt help at all same freezzes

Hi,

Please try to send a short recording of how the lag looks like and when exactly it happens (straight when IR starts, some time after, when selecting a material etc.) and please also share your specs - this is very important for this issue.

[Quest]

New hotfix didnt help at all same freezzes

Hi,

Please try to send a short recording of how the lag looks like and when exactly it happens (straight when IR starts, some time after, when selecting a material etc.) and please also share your specs - this is very important for this issue.

Windows 24h2 26100.2894
Ryzne 9950Х
Asus b650E-F bios 3067
DDR5 gskill 96 gb 4800/5200 expo

Befor hotfix there was a problem with memory but no freezes with PC (actually they was only if turn on expo or OC memory), now after hotfix no metter expo on or off there no problem with memory leak but all time freezz, lags basicly you cant normaly control UI or windows, on clear corona 12 all ok.

sorry video abit heavy 5min duration 4k
https://drive.google.com/drive/folders/1VISfs5HjCwsPyMrg7Fl34mDSCDXxhhnC?usp=sharing

[fatherrain]

Just making sure I understand this correctly:
@fatherrain - you are still experiencing slowdowns with Corona 12 Update 1 Hotfix 1 with Expo enabled. If you disable Expo, it goes back to normal.
@Naxos - you have Expo enabled and Corona 12 Update 1 Hotfix 1 works correctly for you without the lags.

Is the above correct?

yes, as you said. My problem continues in the latest version.

[fatherrain]

For those who have problems, can you write the exact model of the ram?

[Quest]

For those who have problems, can you write the exact model of the ram?

G.Skill 96 GB (2x48GB) DDR5 5200 MHz Ripjaws S5 Matte (F5-5200J4040A48GX2-RS5K)

[skogskalle]

I think I have the same problem with my new 9950X.  But in my case the interactive rendering works almost ok, it lags but doesnt freeze. Its the normal rendering that doesnt work at all.  Max freezes for 10-30 seconds then responds for a few seconds before freezing again. Impossible to do anything else on the computer.
I just made a test removing the side of the computer and I could render for 10 min without freezing, so I guess the problem in my case is that the cpu gets too hot. With the computer case closed it goes to 95 degrees in a few minutes when rendering and freezes almost instantly.

I downloaded the corona benchmark and it ran without problems. Its rendering in max that doesnt work. Cant say if this is a problem just with my cpu cooling or if there is something in corona making the cpu go crazy.

[fatherrain]

It is normal for the processor to be at 95 degrees. It works at the same temperature for me too. There is no problem with rendering during IR, but the system freezes. Sometimes the system shuts down completely. When it is turned off, the temperature is often around 80 degrees. If you use the bios at default setting you will see the difference.

[fatherrain]

For those who have problems, can you write the exact model of the ram?

G.Skill 96 GB (2x48GB) DDR5 5200 MHz Ripjaws S5 Matte (F5-5200J4040A48GX2-RS5K)

Our RAMs are different. So the problem is not related to RAM. Could there be a problem with some processors in the 9950x processor family? As far as I understand, this is not a problem with all 9950x processors.

[Naxos]

It has been working like a charm with 9950X since it's came out... Just the day after win11 24H2 upgrade it began to freeze...
Maybe not related, but very suspicious...

[Quest]

For those who have problems, can you write the exact model of the ram?

G.Skill 96 GB (2x48GB) DDR5 5200 MHz Ripjaws S5 Matte (F5-5200J4040A48GX2-RS5K)

Our RAMs are different. So the problem is not related to RAM. Could there be a problem with some processors in the 9950x processor family? As far as I understand, this is not a problem with all 9950x processors.

Well look) all PC with different RAM, AIO, MB. 1 with 5950+24h2 and 3 with Ryzen 9950X + 24h2 my AVG temps 75-80 with OC mode. (also latest bios)

But there still few minor difference...
1st PC have zero problems with Corona 12.1 and it have windows 24h2 10.0.26100.1742 and EXPO off.
2nd PC with 24h2 10.0.26100.2894 and Corona 12.1 have no stuttering but if turn on EXPO its starts, also it start frezz with Corona 12.1.1 no metter EXPO on or off.
3rd PC with 24h2 10.0.26100.2314 and Corona 12.1 have stuttering even if EXPO off, and same with Corona 12.1.1
4th PC Ryzen 5950Х with 24h2 10.0.26100.2314 and Corona 12.1  have no stuttering with EXPO on.

Also after Corona 12.0 scene parsing in 12.1 take about 30 sec befor was 10-15 sec (I guess of scene state, have to test more)
In general interactive and production render worse then was on Widndows 23h2 and Corona 12.0 (memory leak, frezzes, longer parsing)

[Naxos]

@Naxos - have you tried the Hotfix 1? It's different than the daily build. There are some fixes in it specifically for these kinds of problems.
https://www.chaos.com/corona/download

Problem is that my newest max files will not open if they are set to corona 13 and i have corona 12, will they ?

[skogskalle]

It is normal for the processor to be at 95 degrees. It works at the same temperature for me too. There is no problem with rendering during IR, but the system freezes. Sometimes the system shuts down completely. When it is turned off, the temperature is often around 80 degrees. If you use the bios at default setting you will see the difference.

The bios are at default settings. Dont think its good for the processor to be at 95 degrees.  If it gets hotter than 95 I think it starts to throttle which I believe is whats causing the freezing problems for me.  Again - by removing the side of the computer it lowered the temp by a couple of degrees and all the freezing/problems went away.  Not sure if this is connected to your problem or not, but the symptoms are similar.  I will return the computer to the store tomorrow so they can take a look at the cooling. Maybe they made a mistake when they put it together.
However, the problem only occurs when rendering corona in max. I have the latest hotfix installed. Latest win11 version. When running the corona benchmark there is no problem with temp or freezing, so maybe there is a problem with corona for max?

[fatherrain]

I don't know your situation. Of course, the processor does not always work at 95 degrees. When I have a freezing problem, the processor temperature is not very high. Everything is normal when EXPO is closed. There is no freezing at all when rendering normally.

[Quest]

It is normal for the processor to be at 95 degrees. It works at the same temperature for me too. There is no problem with rendering during IR, but the system freezes. Sometimes the system shuts down completely. When it is turned off, the temperature is often around 80 degrees. If you use the bios at default setting you will see the difference.

The bios are at default settings. Dont think its good for the processor to be at 95 degrees.  If it gets hotter than 95 I think it starts to throttle which I believe is whats causing the freezing problems for me.  Again - by removing the side of the computer it lowered the temp by a couple of degrees and all the freezing/problems went away.  Not sure if this is connected to your problem or not, but the symptoms are similar.  I will return the computer to the store tomorrow so they can take a look at the cooling. Maybe they made a mistake when they put it together.
However, the problem only occurs when rendering corona in max. I have the latest hotfix installed. Latest win11 version. When running the corona benchmark there is no problem with temp or freezing, so maybe there is a problem with corona for max?

1000% problem not in temps, and 1000% problem in microcode of something

[maru]

95C is the Tjmax of a 9950X so it definitely shouldn't be that hot. If removing your PC case panel and lowering the CPU temperature helps, then cooling is definitely the culprit.
Software cannot overheat a CPU. The cooling has to be efficient enough to cool down a CPU even under 100% load (which is what Corona does).

It seems that multiple people here are experiencing multiple different problems.

[Aram Avetisyan]

I wanted to write earlier, that the descriped behavior sounds like overheating issues, and here are my notes:

CPU is ok to push itself to 95% if it does not throttle. It can be so that even when CPU throttles, lowers the clock speeds to cool itself down, there is still not enough coolling and it just stays on 95%, just to keep working and to not bluescreen the machine.

Other users have already reported that v12 update 1 hotfix 1 has solved the lagginess issue(s) for them.

So, to make sure the issue is not v12 update 1 hotfix 1 related (or Corona related), please try earlier versions, specifically v11 or v10, if you can, or other CPU intensive workloads.
Earlier versions can be downloaded from: https://www.chaos.com/corona/3ds-max/download/old

[Naxos]

I wanted to write earlier, that the descriped behavior sounds like overheating issues, and here are my notes:

CPU is ok to push itself to 95% if it does not throttle. It can be so that even when CPU throttles, lowers the clock speeds to cool itself down, there is still not enough coolling and it just stays on 95%, just to keep working and to not bluescreen the machine.

Other users have already reported that v12 update 1 hotfix 1 has solved the lagginess issue(s) for them.

So, to make sure the issue is not v12 update 1 hotfix 1 related (or Corona related), please try earlier versions, specifically v11 or v10, if you can, or other CPU intensive workloads.
Earlier versions can be downloaded from: https://www.chaos.com/corona/3ds-max/download/old

I'm not ready to test hotfix for Corona12, as i've installed Coroan 13 daily build, and my current files are now set to Corona 13.
If i go "back" to Corona 12, they will complain about it uppon opening of scenes , right ?

[maru]

It should work, but we cannot guarantee that, sorry.

[TomG]

Note that older versions of Corona can open files saved with newer versions if no features used in the saved scene have been updated. For example, Corona 12 files won't open in earlier versions of Corona due to changes in the tone mapping (addition of auto white balance and auto exposure) so when a Corona Camera is in the scene, it has the data for those new tone mapping features, and Corona 11 etc. doesn't know what to do with that data so can't open the scene. This will allow you to make a good guess as to whether a scene saved in a newer version will open in an older.

[Quest]

I wanted to write earlier, that the descriped behavior sounds like overheating issues, and here are my notes:

CPU is ok to push itself to 95% if it does not throttle. It can be so that even when CPU throttles, lowers the clock speeds to cool itself down, there is still not enough coolling and it just stays on 95%, just to keep working and to not bluescreen the machine.

Other users have already reported that v12 update 1 hotfix 1 has solved the lagginess issue(s) for them.

So, to make sure the issue is not v12 update 1 hotfix 1 related (or Corona related), please try earlier versions, specifically v11 or v10, if you can, or other CPU intensive workloads.
Earlier versions can be downloaded from: https://www.chaos.com/corona/3ds-max/download/old

Hello, on the previous page I gave information based on tests of 4 and already 5 computers, I also attached a video from one, there is a connection between all this, namely Ryzen 9950 and the latest updates of Corona (and possibly in BIOS and Windows), but what exactly the problem is is not yet clear
p.s

5th PC has windows 23h2 222631, no expo on, same motherboard same bios as on others. Corona 12.1. No shutters or so

in a week there will be bios and drivers update related to 9950 ryzen will update info after

[Naxos]

Note that older versions of Corona can open files saved with newer versions if no features used in the saved scene have been updated. For example, Corona 12 files won't open in earlier versions of Corona due to changes in the tone mapping (addition of auto white balance and auto exposure) so when a Corona Camera is in the scene, it has the data for those new tone mapping features, and Corona 11 etc. doesn't know what to do with that data so can't open the scene. This will allow you to make a good guess as to whether a scene saved in a newer version will open in an older.

Ok, i'll not try so. Have we any eta idea for Corona 13 ?

[TomG]

Corona 13 will be in June. Corona 12 Update 2 will be before that, though, set for end of March at the moment.

[skogskalle]

95C is the Tjmax of a 9950X so it definitely shouldn't be that hot. If removing your PC case panel and lowering the CPU temperature helps, then cooling is definitely the culprit.
Software cannot overheat a CPU. The cooling has to be efficient enough to cool down a CPU even under 100% load (which is what Corona does).

It seems that multiple people here are experiencing multiple different problems.

Yeah sorry, mine is probably not related to the original issue here. I brought the computer back to the store today and they ran some stresstest of the cpu and the temp went up towards 95 after only a couple of minutes, and the temp dropped quickly when they removed the side of the computer.  I guess they will try to get the temp under control with better fans/cooling and we ll see what happens... 
I thought it was strange that I could run the corona benchmark without problems, but maybe it just didnt last long enough for the temperature to spike...

[Quest]

I don't know your situation. Of course, the processor does not always work at 95 degrees. When I have a freezing problem, the processor temperature is not very high. Everything is normal when EXPO is closed. There is no freezing at all when rendering normally.

Any update?

Another new build win 23h2, 9950x, 64 gb ram, expo off. No lags or frezzes (Corona 12.1)

I have big feel that main problem is in windows 24h2. They did something that boost games and not redner)

[maru]

Any update?

Another new build win 23h2, 9950x, 64 gb ram, expo off. No lags or frezzes

I have big feel that main problem is in windows 24h2. They did something that boost games and not redner)

What exactly do you mean by "another new build"?

[Quest]

Any update?

Another new build win 23h2, 9950x, 64 gb ram, expo off. No lags or frezzes

I have big feel that main problem is in windows 24h2. They did something that boost games and not redner)

What exactly do you mean by "another new build"?

6th PC with 9950 Ryzen.

[maru]

Oh, ok, I thought you mean Corona build or Windows build. Thanks for clarifying.

[maru]

Is there anyone with this problem using other CPU than 9950X?

[skogskalle]

Ok Im back...

Just got the computer back with better cooling and now it stays around 85-87 degrees, but it still freezes during rendering!  Before it seemed to only freeze/stutter when reaching around 95 degrees but now it freezes at lower temps.  Impossible to work in any other program during normal rendering, and when I tried interactive rendering it froze so bad I had to close max from the task manager.

I just tried the corona benchmark again.  Ran it 3 times (just pushing "restart") and it gave me 3 differens scores. First time 13 500 000, second 12 500 000 and third 14 400 000.  The first two are too low, and i really dont see why it gives different results. No other major programs open at the time and no changes between the three runs.

Not using EXPO for the ram.  I have 4x32 GB running at 3600 MT/s.  Im on win 11 24H2.  9950x (not overclocked).  Corona 12 update1 hotfix1

What is going on??

Im willing to try to roll back to win11 23h2 and see if it works better. Is it possible to roll back without having to reinstall everything on the computer?   

[Quest]

The last option that left to test its roll back from 24h2 to 23h2. At this moment I have tests from new 8 PC with 9950, different ram, motherboards, and AIO all of them expect 1 with 24h2

This bug fist time we get with version Windows 11 Pro 24H2 26100.2033 and newer, and there was no bug on Windows 11 Pro 24H2 26100.1742 and seems 23H2 any version.
When it was only with one PC there was no point for alarm, but now with 8th PC its a clear problem

Freezing occurs under certain circumstances.

So problem not it motherboards/ram or overcloking ram/cpu, or even temps. We try differect bios update awell!
Seems left only few options windows, corona and amd chipset drivers (last one most likely not but...)

Atm I cant give more test couse no time reinstall withdows on all PC. But the last one with 23h3 no frezzes on corona 12.1 (didnt test yet 12.1 hf 1)   

p.s but there strange thing on one PC if turn off EXPO, there no such a problem with corona 12.1 and if install corona 12.1.1 its totaly frezz PC no metter EXPO on or OFF.
So stepback to "Freezing occurs under certain circumstances."

[Naxos]

My 2 cents :

Went back to Corona 12 hf 1 : behaviour is a lot better than 13 daily build.

So, as i've updated BIOS, let EXPO ON, changed to Corona 12 hf 1, i d'ont really know what makes it better, but something did.

[Naxos]

MMMh... half bad news :
Now that my scenes are set with Corona 12 UP 1 HF 1, i can't open them on friend's PC as 3dsmax crashes directly : she has Corona 12 HF 1 (not Update1)

I'll have to wait until she comes back to install new one (i do have access to PC for convinience, but not admin for install)

Is there anyway to set the scene "openable" on Corona 12 hf1 ? I don't know, some hidden magic parameter to save as older version, like 3dsmax does ?

Really urgent as i need to render animation for monday.

[romullus]

It's likely due to Corona camera. If you can open your scene in UP1 and delete all the Corona cameras, it might start loading in HF1 without crashing.

[Naxos]

It's likely due to Corona camera. If you can open your scene in UP1 and delete all the Corona cameras, it might start loading in HF1 without crashing.

Ok, this is a good workaround... I'll have to recreate cams and their animation, but it let me render with 3 PC instead of 1, many thanks !

[Naxos]

It's likely due to Corona camera. If you can open your scene in UP1 and delete all the Corona cameras, it might start loading in HF1 without crashing.

Do you think Physical cameras will solve the problem ? It is easier to create new PhyCams within the main scene, then remove coronaCams than add them from scratch

[romullus]

Do you think Physical cameras will solve the problem ? It is easier to create new PhyCams within the main scene, then remove coronaCams than add them from scratch

Yes, physical cams should be good. As long as there are no Corona cameras in the scene, it should open in HF1.

[Naxos]

Do you think Physical cameras will solve the problem ? It is easier to create new PhyCams within the main scene, then remove coronaCams than add them from scratch

Yes, physical cams should be good. As long as there are no Corona cameras in the scene, it should open in HF1.

Cool, thanx !

[skogskalle]

Hey Corona team - have you been able to reproduce the freezing/stuttering on 9950x and win11 24h2?
My new workstation is just a very expensive pile of rubbish until this gets fixed :( Would be great if you could look into this and figure out if the problem is in coronas code or in Windows. Or whatever else might be causing the issue.

[Quest]

Hey Corona team - have you been able to reproduce the freezing/stuttering on 9950x and win11 24h2?
My new workstation is just a very expensive pile of rubbish until this gets fixed :( Would be great if you could look into this and figure out if the problem is in coronas code or in Windows. Or whatever else might be causing the issue.

Hey i've join to this request, unfortunately have no time atm to reinstall windows.

There few main options left or its problem with Windows 24h2 or its problem in Corona or bouth)

[skogskalle]

Corona team?

I just bought a month license for Vray to check if it also freezes. I think the load on the cpu would be about as maxed out using vray as using corona?

Vray has no problems with freezing, and I can use photoshop freely at the same time.  I made a scene with only two simple materials (basic white wall and glass) and no textures, and tried it in both corona and Vray.  Corona freezes and stutters, vray does not.  Both push the cpu to about 88 degrees.

Most of the time corona freezes I can still move the cursor, but cant click anything. Sometimes the cursor also freezes in place.

So to recap.  Latest windows 24h2, 3dsmax 2024, corona 12 update1 hotfix1, motherboard msi mag b650 tomahawk, 4x32 gb ram running 3600 MT/s no expo, Ryzen 9 9950x no overclocking.

I can also run cpu stresstests like OCCT that push the cpu to its max without problems.  But rendering or using interactive render in corona breaks my computer completely.

Do you need more info from me - ask. I very much want this issue solved asap.

[fatherrain]

The problems experienced are apparently not frequent enough to attract the attention of the corona team. They haven't said anything about a solution yet. Actually, it could be like this. I think they are waiting for us to diagnose them in order to offer a treatment. Someone should come out and try different environments. Find the problem clearly. They say we will see the solution in six months. Dear corona team, we expect urgent solutions from you regarding the problems. If we are writing in the wrong place, someone should come out and tell us. Let them ask us what you are asking us to do on the forum. The systems where the problems are are known. It should not be our job to install similar machines to the machines experiencing the problem and try them with different versions. Whoever is responsible for finding and solving the problem should step forward. Yes, there are people in the forum who value and care about us. I thank them. But someone should diagnose the problem now. If the problem is the CPU, let's burn it and buy a new one before the warranty runs out. If the problem is the operating system, let's change it. If the problem is with corona, let's go back to the old days before it's too late. I have lost 15 days for this problem. Days when I struggle to see if my machine is broken. In the meantime, if there is someone working on the problem, let them come out and tell me.  Don't let your eyes blink in the dark. Let us know that you are cared for.

[maru]

The problems experienced are apparently not frequent enough to attract the attention of the corona team.

What exactly makes you think so? We received multiple support tickets about this problem. The common denominator for now is the CPU model (9950X), although we have a similar report from a 3970X.

They haven't said anything about a solution yet.

We can't say anything about a solution if we don't have a solution.

If we are writing in the wrong place, someone should come out and tell us.

While the forum is monitored and the support team is actively taking part in discussions, our official channel for any issues is the help center where you can submit a support ticket: https://support.chaos.com/hc/en-us/requests/new

Let them ask us what you are asking us to do on the forum.

We would like to find out with which exact Corona version the problems started. If you would like, please try installing daily builds one by one and let us know which ones works fine and in which one the problem appears. Alternatively, please send us a ticket and we will arrange a Team Viewer session with you.

[maru]

I was on a Team Viewer session with Skogskalle, but unfortunately I wasn't able to find a solution or even tell what exactly is happening. The problem was freezing happening a few seconds after starting production rendering (total system freeze, can't move windows, etc, it would even kick me out of Team Viewer).
I have one important finding though: the same kind of freeze happened with various V12 versions (including daily builds) and even Corona 11 Hotfix 2. So it appears this is not Corona version-dependent, or at least not something that happened in Corona 12 U1 HF1 or Corona 12 in general.

It might be, though it's just a guess, related to the Windows 24H2 update. There are lots of user reports online about all sorts of performance issues after updating.

[Quest]

I confirm, several more PCs were assembled on the 9950 base, and the problem is not observed on them with 23H2.

The problem appeared in versions newer than Windows 11 Pro 24H2 26100.1742

p.s Unfortunately, there is currently no way to reinstall 23h2 on other PCs to 100% confirm the absence of the problem.

[skogskalle]

Thank you Marcin for your time and trying to fix the problem today!

For you others with this problem - do you use Bitdefender for antivirus?  And is it by any chance provided remotely using some sort of "managed antivirus solution".  The next thing for me to check is to disable my managed antivirus and see if it makes a difference. (but since its handled remotely I dont know how to shut it down locally - will try tomorrow...)  I know some people have been having problems with bitdefender slowing down certain programs. Havent read of any problems with corona though and have been using bitdefender on my old computer without problems so its a longshot, but maybe you could try and see if It makes a difference?

Or maybe its 24h2 causing it after all. Like Quest I havent found a way to install 23h2 to check.

[fatherrain]

Taking my message point by point has taken the topic out of context. I just think I have the right to reproach. Should I not reproach?

Since we have gone beyond the solution-oriented conversation, let me say a few things.

I opened this issue in the forum. I did not buy a ticket regarding this issue. Because this forum is directly the ticket itself. It's customer service. It is public relations. If not, warn me at some point and I would be grateful to you.

And yes. When I saw the messages about the problem and the things you asked, I thought you were not taking the issue seriously. There are people who write clearly about their system and problem. Simulate systems. Don't ask us for our watches. Do old new installations and find the problem. This is the job of the corona team. We have to wait for the March update. If the problem is not solved, we will wait another six months. I solved the problem by closing the "EXPO". What about those who can't figure it out?

There is a saying in our country. If you blink in the dark, I can't see it. Are you really interested in us? Are tickets, teamviewer connections etc. available? We don't know this. "We are just waiting in this forum." We do not know if the problem is a general problem. We don't know if it's just us. The problem is either very small, very few people are affected, or no one cares. "There is no solution, there is no need to talk"... It's amazing.

I asked you to tell us what we should do. You shared a few suggestions. Translation error I guess. Don't tell me what to do until you find the solution. Do you really want me to waste my systems and resources on you? Is this software open source? If you want to see what the older version answers, get an x9950 machine. Install old version. Install new version. Look for the differences. Diagnose the problem. And help us plug the problem for now. We will come out of quarantine when we find the vaccine for corona.

Finally, we are waiting for your answer regarding the solution or process. Do not criticize our comments. We are also trying to solve the problem. Don't you realize?

"Please share what stage you are at and what you are doing." So we can understand that there are people who are really working. It's been two and a half months since the issue was opened. Communication remains weak.

I would like to thank the clients and the corona team who tried to find a solution. Especially to you @maru. The Corona team is not 3 people, but you are the person we see the most.

[maru]

Sure, let's try to understand what is going on and hopefully find a solution together.

Just one note:

I opened this issue in the forum. I did not buy a ticket regarding this issue.

In case there is some misunderstanding here, you don't have to buy anything. You can simply go here and submit a support ticket: https://support.chaos.com/hc/en-us/requests/new
This guarantees that you will be assisted as quickly as possible by our support team.

Thank you for your kind words and sorry if my message sounded unthoughtful or disrespectful.

Update:I have created support tickets for everyone from this forum thread. For now, I am only asking basic questions to collect information. Please respond to my message.

[skogskalle]

So - part of my problem was caused by Bitdefender antivirus. After uninstalling it I can actually render without freezing, and working in other programs at the same time works as well!  I dont know yet if it renders as fast as it should, but at least it renders.

However - the freezing is still there when using interactive render. It seems to work for a little while but then gets more and more frozen to the point where adjusting anything in the scene is impossible.

The problem is also still there in corona benchmark - it doesnt freeze like the interactive render but it stutters (like 1 second freezes) which affects the score.  Getting varying and too low scores. Ran it 3 times today and got from 11500000 to 13500000. All too low for this cpu.

Not a solution to the original problem in this thread , but if your normal renders freeze and you use Bitdefender - try uninstalling it.

[Naxos]

Hello there,

Good and bad news :

Good one : disabling EXPO did solved the lag problem, al least for this first hour testing.

Bad news : my ram is now working at 4800 instead of 6000...

Slower, but not freezing, the overall is a good news !


Next step is to go back in BIOS, set manually the latencies, and check again... I'll try to find time for that today.


Best regards.

[maru]

I've found this article: https://arstechnica.com/gadgets/2024/08/amd-explains-promises-partial-fixes-for-ryzen-9000-performance-problems/
Here are the highlights, maybe they would be worth trying:

- update your chipset driver
- update your BIOS
- disable core parking - https://learn.microsoft.com/en-us/answers/questions/1524213/remove-parked-status-of-cpu
- disable core isolation and virtual machine platform - https://www.makeuseof.com/windows-disable-two-virtualizations-game-performance-boose/
- go to BIOS and set CPU SoC voltage from the default 1.25V to 1.2V and Infinity Fabric (FCLK) to 2000 MHz
- change your power plan in Windows (try all available options, power saving, high performance, etc)

[Quest]

Corona not alone with such a problem, and seems the fix is the same rollback to 23h2
So its clear now the problem not directly in corona at all, tnx Microsoft ones again.....

[skogskalle]

Thank you Maru!

Havent tried all of the suggestions yet, but disabling core parking made a huge difference here.  I have to run more tests, but I think I could both render and use interactive render without much problems after that!  Then I reinstalled Bitdefender and now Im having problems with the interactive renderer again... but im guessing thats a problem they have to solve and nothing you can do much about. Normal rendering seems to work fine even with bitdefender installed now.

the "disable core isolation" option made everything worse here so not using that.

[maru]

Perhaps you could add 3dsmax.exe as an exception to your antivirus?
It's really interesting to hear about disabling core parking bringing some improvement. It would be great if other users could try it and share their outcomes.

[kacarsoys]

Hello, I am using x9950 and when I start rendering, the pc freezes, I can't solve it no matter what I do.

[maru]

Hello, I am using x9950 and when I start rendering, the pc freezes, I can't solve it no matter what I do.

Have you tried following this checklist?

- update your chipset driver
- update your BIOS
- disable core parking - https://learn.microsoft.com/en-us/answers/questions/1524213/remove-parked-status-of-cpu
- disable core isolation and virtual machine platform - https://www.makeuseof.com/windows-disable-two-virtualizations-game-performance-boose/
- go to BIOS and set CPU SoC voltage from the default 1.25V to 1.2V and Infinity Fabric (FCLK) to 2000 MHz
- change your power plan in Windows (try all available options, power saving, high performance, etc)

[skogskalle]

Perhaps you could add 3dsmax.exe as an exception to your antivirus?
It's really interesting to hear about disabling core parking bringing some improvement. It would be great if other users could try it and share their outcomes.

Already added 3dsmax.exe as an exception but didnt seem to make much difference.  Will make some more tests when I have the time.

[fatherrain]

I found a similar article when I first experienced the problem. Turning the core park option on or off didn't make a difference for me. Using the motherboard bios settings in the default settings solves the problem for now. I'm waiting for the new Windows update. Maybe something will be fixed. Also pay attention to the processor fan. Heating problems make the system unstable. Liquid cooling is disappointing. Tower fans offer more effective solutions. I'm not very expert in this subject, but this is how I experienced it. By the way, I'd appreciate it if you could write your experiences with expo off in the Bios settings.

[Quest]

I found a similar article when I first experienced the problem. Turning the core park option on or off didn't make a difference for me. Using the motherboard bios settings in the default settings solves the problem for now. I'm waiting for the new Windows update. Maybe something will be fixed. Also pay attention to the processor fan. Heating problems make the system unstable. Liquid cooling is disappointing. Tower fans offer more effective solutions. I'm not very expert in this subject, but this is how I experienced it. By the way, I'd appreciate it if you could write your experiences with expo off in the Bios settings.

- I can't agree with you about cooling, and the problem is not because of it or overheating up to 95C (Add few screens from few pc with 9950x with AIO)

- Regarding the search for certain ways to solve problems, today everything comes down to two methods: one works for many, the second does not work for everyone.
1. Rollback to 23h2 2. Turn off expo (And problem not directly in OC memory or OC CPU)

- There small chance that upcoming bios update can solve problem

- Wait for windows update can take long, they acctualy fix that problem befor and seems after 10.0.26100.1742 broke something again.

- There no point wait from Corona team that they make miracle, becouse main source of problem its a Windows and bios

p.s There will be latest test when new stable bios released one with 24H2 + expo on + cpu oc and if that wont work 23H2 + expo on + cpu oc

[fatherrain]

As I said, I am not an expert on the subject. You may be right about the cooling. I don't know if the new BIOS will solve all the problems. I am currently using Bios 1103 beta. There are some improvements in this version. In previous versions, I used to experience pauses even in a basic scene (only the teapot), but now I don't. I experience them in large max projects or when several applications are open at the same time. But of course it is not enough. My old computer has a 7950x3d processor. The same problems are there. It is not a problem that only applies to the 9950x. I have another question in my mind. I can't answer. Not everyone has this problem. Is there hardware or applications that should not come together that make us special? I don't know if this perspective is correct.

[kacarsoys]

Hello, I am using x9950 and when I start rendering, the pc freezes, I can't solve it no matter what I do.

Have you tried following this checklist?

- update your chipset driver
- update your BIOS
- disable core parking - https://learn.microsoft.com/en-us/answers/questions/1524213/remove-parked-status-of-cpu
- disable core isolation and virtual machine platform - https://www.makeuseof.com/windows-disable-two-virtualizations-game-performance-boose/
- go to BIOS and set CPU SoC voltage from the default 1.25V to 1.2V and Infinity Fabric (FCLK) to 2000 MHz
- change your power plan in Windows (try all available options, power saving, high performance, etc)

I did everything we wrote but the result did not change :(

[ParaEagle]

After updating to Windows 11 24H2, I encountered a serious issue with Corona Renderer. During rendering, my computer would completely freeze, making it impossible to use.
However, I found a solution! I installed the Windows 11 update from the Beta Channel (KB5052086), and it completely resolved the freezing problem.
If anyone else is facing similar issues, I highly recommend giving this update a try. Hope this helps!

[Sedrax]

Thank you very much. It really works. Yesterday I assembled a PC based on the 9950x processor. And I've been suffering for 2 days. At the beginning of interactive rendering - work was simply impossible!! Everything hung. Tried almost everything that was written above, nothing helped. But after installing the beta version of the Windows update - a miracle happened!!!! Everything is up and running great with the XMP profile enabled! Friends, try it, who had such problems..

[lupaz]

After updating to Windows 11 24H2, I encountered a serious issue with Corona Renderer. During rendering, my computer would completely freeze, making it impossible to use.
However, I found a solution! I installed the Windows 11 update from the Beta Channel (KB5052086), and it completely resolved the freezing problem.
If anyone else is facing similar issues, I highly recommend giving this update a try. Hope this helps!

Could you post a link for everyone else please?

[ParaEagle]

Could you post a link for everyone else please?

I didn't download it from an external source. I simply went to the Windows 11 Settings > Windows Update > Windows Insider Program, switched to the Beta Channel, and updated to the latest patch from there.

[Sedrax]

I did the same. But you have to hurry, because as far as I know, Microsoft wants to ban the transition to the Beta version at the end of the month.

[bcarnevalli]

I can confirm that the beta update from windows 11 works.
I can´t understand that in 2025 we still have this kind of behaviours on apps.

[Quest]

Hello, new update to 26100.3321  (KB5052093) seems to solve problem (it's not beta/dev channel)

[Renovacio]

Disabling EXPO helped me.

It didn't help:
- update your chipset driver
- update your BIOS
- disable core parking - https://learn.microsoft.com/en-us/answers/questions/1524213/remove-parked-status-of-cpu
- disable core isolation and virtual machine platform - https://www.makeuseof.com/windows-disable-two-virtualizations-game-performance-boose/
- go to BIOS and set CPU SoC voltage from the default 1.25V to 1.2V and Infinity Fabric (FCLK) to 2000 MHz
- change your power plan in Windows (try all available options, power saving, high performance, etc)

Installing the latest Windows 11 (KB5052093) update did not help.

[ParaEagle]

Installing the latest Windows 11 (KB5052093) update did not help.

  Hi,  I saw that installing the latest Windows 11 update (KB5052093) did not help.  Could you also try the Beta Channel update (KB5052086) that was mentioned earlier in this thread? It would be helpful to know if this update works for you or not. 

[davevc]

Hi all. Just got a new build PC with the 9950x, using Max 25 and Corona 12.1 HF1, Windows 11Pro and having issues very similar to what has been described in this post. Max freezes really bad when rendering and also intermittment freezes when using interactive rendering
Did anyone get to the bottom of this please?
thanks

[maru]

@davevc here is what we know so far, based on user reports:

We have received multiple user reports of slowdowns / freezing issues with the 9950X CPU. It seems to be related to Windows Update. Here are the things that are currently known to help users with this problem:
- Rolling back to Windows version 23H2, if possible. You could also check for Windows Updates and install the newest one if it is available - perhaps the problem is fixed there.
- Disabling the EXPO/XMP/DOCP option in BIOS. This option is responsible for RAM overclocking and apparently disabling it improves the performance for users with this problem.
- USE AT YOUR OWN RISK - we are not responsible for any potential issues caused by this and you may not be able to disable this option or return to a previous Windows version: enable the Windows Insider Program in the Windows Update settings and download the newest available Windows Update. 

Other than that, you can try the following steps one by one, but they seem to improve performance only intermittently:
- disable core parking - https://learn.microsoft.com/en-us/answers/questions/1524213/remove-parked-status-of-cpu
- disable core isolation and virtual machine platform - https://www.makeuseof.com/windows-disable-two-virtualizations-game-performance-boose/
- go to BIOS and set CPU SoC voltage from the default 1.25V to 1.2V and Infinity Fabric (FCLK) to 2000 MHz
- change your power plan in Windows (try all available options, power saving, high performance, etc)
- disable SMT (simultaneous multithreading) in BIOS

Unfortunately, this issue doesn't seem to be caused by Corona, it is rather a side-effect of some changes introduced in Windows Updates, so we can only hope that Microsoft will release an official fixed update soon.

[davevc]

@maru

Many thanks for your swift reply. I will have a look at those options and also keep my fingers crossed that Microsoft release a fix for this very soon, if thats where the problem lies.

[davevc]

Hi @maru

Just a quick update to let you know that disabling DOCP in the BIOS seems to have worked. Interactive render, local full render and ditributed render no longer causes the workstation to freeze, it is much more stable.

I will keep an eye out for any Microsoft updates that may fix this issue and then try enabling the DOCP again

thanks again for your quick response on this, very much appreciated.

[maru]

Great, thank you for confirming. Disabling the DOCP/EXPO/XMP option seems to be the most reliable workaround for now.

[maru]

Just a random idea: could someone with this problem try switching to the 3ds Max VFB and see if the issue is still there?
Render Setup > System > System Settings > VFB Settings > Type > Native 3ds Max VFB (you need to reset/reload scene for this to take effect)

[skogskalle]

Ive been away for a couple of weeks, but the latest win11 update seems to have fixed everything for me.  I can run Bitdefender too and render without problems.  For me the main problem was definitely a windows-issue.

[maru]

Fantastic news! Do you have the EXPO/XMP/DOCP option enabled in BIOS? In some of the previous reports the Windows Update kind of helped, but only with EXPO off.

[skogskalle]

No overclocking here whatsoever. I tried enabling expo before but the computer wouldnt even boot. The problems seems to be me having 4 sticks of ram. It seems to be a better idea to use only two sticks if you want to run them at faster speeds.

[Quest]

Just a random idea: could someone with this problem try switching to the 3ds Max VFB and see if the issue is still there?
Render Setup > System > System Settings > VFB Settings > Type > Native 3ds Max VFB (you need to reset/reload scene for this to take effect)

Hey

Native 3ds Max VFB = no effect
Legacy Corona VFB = no effect
Another big update for windows 11 24h2 = no effect

Also, I have big feel that's corona and 3ds max in general works slower and worse on Windows 11 than on Windows 10)

[maru]

Another wild guess, but hopefully worth trying:
Navigate to Windows Security > App & Browser Control > Exploit Protection and disable "Control Flow Guard"
You can also try disabling all the other settings which are listed there.
Afterwards, please restart your computer and check if the performance is any better. If not, then please turn all those options back on.
Thank you in advance for testing this.

[Quest]

No effect

[maru]

Thank you for checking!

[Sedrax]

I want to correct my last message. I described that after updating Windows the problem disappeared - and it really is. But yesterday a new update  was released (10.0.26120.3576) (KB5053650), after which the freeze during interactive rendering returned again... How much can you.......


I want to add. If you disable the XMP profile, the problem is solved... Before this update, everything worked with the XMP profile. In general, we'll see what happens next, because this is not normal.
New update with XMP profile disabled - works correctly

[andy.shust]

I have a Ryzen 9900x and I experience the same described freezes in Interactive Render. The program freezes for a second every 5-10 seconds.
I am using Corona 9 Hotfix 2 and 3DsMax 2022, on Windows 11 Home 24H2 (build 26100.3476), no Beta / Insider Program updates. CPU hits around 70-75 degrees when rendering / benchmarking.
From all the suggested solutions in this thread I only set memory speed to default in BIOS, and it solved the problem. I have a 6400Mhz RAM, and I have to have it running on 4800 which the system chooses as default.
Also, setting memory speed to default improved my Corona Benchmark score slightly (which is weird tbh).

[andy.shust]

I have a Ryzen 9900x and I experience the same described freezes in Interactive Render. The program freezes for a second every 5-10 seconds.
I am using Corona 9 Hotfix 2 and 3DsMax 2022, on Windows 11 Home 24H2 (build 26100.3476), no Beta / Insider Program updates. CPU hits around 70-75 degrees when rendering / benchmarking.
From all the suggested solutions in this thread I only set memory speed to default in BIOS, and it solved the problem. I have a 6400Mhz RAM, and I have to have it running on 4800 which the system chooses as default.
Also, setting memory speed to default improved my Corona Benchmark score slightly (which is weird tbh).

Quick update to my post. The problem is gone for some reason. I enabled DOCP II in my BIOS, and I have zero stuttering or freezing in Interactive Rendering (Production Render works fine, like earlier, too). I don't remember Windows updating in recent days, if that could have fixed the issue.
When I first encountered this problem, my memory was set to 6400 Mhz speed manually in BIOS, however I'm not sure this could be the reason. Maybe later I will set memory speed manually and see if it re-introduces the stuttering, because asides from speed, DOCP also adjusts several other parameters which may have some effects.
I am already confused by this whole issue to a very high degree =D