Render take huge time !!

[benzodm]

Hello everyone, I need help with slow rendering too. I need to render a huge image for the poster, so resolution set to 5906x4724 and rendering is very slow for some reason, also CPU is not loaded at all. I've searched some info about low thread priority, but there is no option like that in Corona 1.5. I used to render the same scene couple of months ago in 2000x1500, and it took me 1-2 hours for 50-60 passes, CPU was loaded with 70% and more, and now it's only 5-10%. Any solution for this?  Also, i've set 3dsmax.exe to real-time priority

AMD Ryzen 5 1600
16gb RAM 2400
3ds max 2016, Corona 1.5

[Njen]

16gb of RAM is not much, sounds like Corona might be hitting your HDD swap disk.

[TomG]

Sounds very much like memory, especially when changing resolution changes the render speed from what would be expected.

This article covers most of the causes / solutions, e.g. LightSelect render elements each need more memory, so higher resolutions with lots of those can require a lot of memory (reducing the LightSelect layers, or even backing LightMix to scene and removing the layers, can help). https://coronarenderer.freshdesk.com/support/solutions/articles/12000023310-i-am-getting-a-sudden-rise-in-ram-usage-