Slow Preview?

Hello, i'm trying to edit a video that have separate frame sequences or .avi videos that are either 3K or 2K in a 2048x2048 composition, but i need to put them in order because i already got the audio, so i need to synchronize it, but i can't since while the audio can be hear on preview, the image freezes sometimes, and the preview is very, very slow, i got an Nvidia Quadro K5000, 32 GB Ram, and Intel Xeon. The computer is supposed to handle those archives without problem but mine i think is not optimized, is there any way i can fix it so i can see the previews in good timing so i can work? (even some videos freezes completely and appear in totally black)
thanks in advance ill be waiting for a response

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Hi Noel,
Yes, I did the upgrade, and I did not experience any problems.
Only, the issues above were not fixed in the update.
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See this page for resources about making After Effects work faster: http://adobe.ly/eV2zE7
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Slow Preview?

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