V-Ray RT CPU slowness..

[Robert]

V-Ray RT is quite becoming slow on CPU at the moment, need that for preview. I may have reset the settings, or an update did. Anyone got some good default settings to make things faster?
The main issue is not rendering, its more that everything in Modos UI turns brutal slow. Like selecting a material and such, this also happens on less complex setting, like a shader ball etc.

[vladimir.nedev]

You could try lowering the number of threads that RT CPU uses.
A negative number means that this many threads out of all CPU threads (physical cores multiplied by 2 for hyperthreading) won't be used.

Greetings,
Vladimir Nedev

[Robert]

Thanks that indeed helped. Set it from -1 to -2. Also the 'fit RT resolution' option like in your screenshot. The only thing is, when I stop RT, it takes a while till Modo becomes responsive again. Not sure how thats related. Got 64 GB RAM.