3dsmax UI and viewport lag

[3dcrgr]

I use Corona 1.7.
Just noticed an odd behavior.
When I work on a scene (around 6M poly) everything is smooth.
If I try to fire up IR - everything is okay.
But once I start the progressive rendering (with DR) it starts normally, but once I stop it and go back on working the scene everything is sluggish and laggy.
If I save and restart 3dsmax with the same scene - everything is smooth again.

[maru]

My first idea is that some antivirus/firewall (e.g. Windows Defender) may be checking the network traffic.

[3dcrgr]

My first idea is that some antivirus/firewall (e.g. Windows Defender) may be checking the network traffic.

Tried playing around with those.. no results.

Now it got even worse. Now even IR lags the scene - even after stopped.

EDIT

Found a solution on this thread
https://forum.corona-renderer.com/index.php?topic=12209.msg85145#msg85145

Seems to be its a case in which CoronaBitmap causes lag with network paths.
Converted back to 3dsmax Bitmap and now everything is smooth again.

Anyway,
when this issues is going to be addressed? Its been a year since that post.