Dave overstates this issue.
I agree with Dave that you should never use OpenGL to render for final output.
I agree with Dave that you should probably not leave OpenGL rendering always on for previews.
_But_, the OpenGL – Interactive setting actually works quite nicely for making rendering faster during interactions—i.e., when you’re dragging things around. The fidelity is poor, but that’s OK when you’re in the middle of dragging something across the screen; and the OpenGL renderer turns off as soon as you let go of the mouse.
Also, the GPU accelerates some effects behind the scenes.
So, while I agree with Dave and many others in saying that it’s not worth spending a lot of money to get a top-notch graphics card for After Effects, I have to point out that there are some values in having at least a reasonable stock GPU with OpenGL features so that you can get these moderate-sized benefits.
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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