IPR wipe struggle

[jasonhuang1115]

Hi,

During CPU IPR, I notice noticeable delays when dragging the wipe line to compare the "A" side with the active IPR rendering. I have saved about 3 CPU threads for UI (low thread priority ON) but still. It feels sluggish to drag the wipe line. Especially after changing a parameter value and IPR is working hard to resolve the noise, the very first drag feels sluggish, kind of waiting for the line to catch up my mouse movements and then it's slightly better but still, the wipe line feels "heavy" if that makes sense. Is there a way to make the experience better in this regard?

Vray v 4.13.01.29285, Maya 2018, AMD threadripper 1950x

[seandunderdale]

Is that the only lag you get during IPR? I have the same CPU and have been noticing some serious lag when trying to work in IPR mode. General UI and tweaking light values sometimes hangs for half a second after each input.

[jasonhuang1115]

changing parameter values is fine but I notice lags when clicking a node to wait for attribute editor to refresh. Sometimes, it doesn't refresh at all until I click off the "A" side.
In general, when IPR is rendering, if I activate the "A" side, overall UI feels laggy than when nothing is set to "A" for comparison.