Thx for the additional info on option ‘a’ … will try out the W/L performance on some larger MG images when we get to that point, although, presumably it is still hardware accelerated so I imagine it will be fine.
As for option ‘b’, your guess is correct … I do call SetDesiredUpdateRate. For volume rendering, I found the default degradation in quality while interacting with volume too severe so I was trying to improve the quality during interaction. If there is a more appropriate way to do that, please let me know.