When you use the Iray Preview window, it uses some system RAM. The problem is it does not release that RAM when you close the preview window. It holds onto that memory until the next time you open the Preview window again, at which time it briefly drops the old memory contents and then fills it up again.

Opening the Preview window a SECOND TIME TAKES AS LONG as it does the first time, so there is NO VALUE in holding onto that memory. It simply holds onto a valuable resource that could be used for other purposes.

If you are not using nearly all your system RAM, this may not be a huge issue, but it's so backwards and should be corrected.


REQUEST: Release the memory when you CLOSE the Preview Window.


PICTURE 1: Launching iClone and opening project
PICTURE 2: First Iray Preview... memory is used... close preview... memory is NOT released
PICTURE 3: Second Iray Preview... releases memory just prior to rendering the new preview... NO TIME IS SAVED

There is no reason not to release the memory as part of the "Close Preview Window" action.



P.S.
This is NOT the same as the recently fixed issue of holding onto graphics card VRAM. This is a DIFFERENT issue.
Issue #4129: https://www.reallusion.com/FeedBackTracker/Issue/Iray-Preview-window-does-not-free-up-VRAM-when-closed-consumes-more-every-time-it-is-opened