My editing team and I have 3 of the new mac pro 3.7 GHZ Quad Core with 12 GB Ram, OSX10.9.3. We edit a TV show and the longer the timeline gets the slower PP gets. The problem is gradual, but by the time I get a timeline that is over 10 minutes long PP becomes very slow and unresponsive. Once my show reaches the 30 minute mark it's extremely slow. The main problem is with playback. I hit play and it takes anywhere from 10 to 20 seconds or more to even start playing. I'm editing footage from a Sony FS 700 and a Sony PXW-Z100, 1080i footage with no effects. Color correction and audio mixing is painfully slow once my timeline is complete. We converted from FCP7 and never had this problem with that program on the same computers. This problem is the same on all 3 computers so this can't be an isolated issue with just one computer.
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