“In the Previews preferences category, you can choose the quality and speed of color management and zoom [Magnification, display resolution, PAR] operations used in previews. From the Zoom Quality or Color Management Quality menu, choose Faster, More Accurate, or More Accurate Except For RAM Previews.
The More Accurate Except For RAM Previews option uses the more accurate operations for manual previews and standard previews, but uses the faster operations for RAM previews [emphasis added]”
As usual Creating Motion Graphics is also helpful. Chris and Trish Meyer recommend keeping Preferences > Previews to More Accurate (unless you have an older computer). For more on OpenGL, which might be best turned off for the most part, see OpenGL basics in After Effects at AE Portal, which riffs off an AEtuts+ video, An Inside Look At OpenGL Within After Effects by Stefan Surmabojov.
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