Sync and Video : Working with Video in Pro Tools : Playing QuickTime DV Video to an External Monitor Over FireWire : Tips for Optimizing Video Playback

Tips for Optimizing Video Playback
When using Pro Tools to play video files, the quality of the playback is dependent on the following:
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Quality of the video hardware used to capture and play back the digitized video
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For more consistently smooth video playback, here are some suggestions:
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Set Scrolling option to None (Options > Scrolling > None).
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Recompress the video at a reduced pixel dimension, for example 320 x 240 pixels to 640 x 480 pixels.
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Use a video clip with less compression (heavily compressed files require more processor speed to decompress for display).
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Hide the video track when not needed (or change from Frames to Blocks view).
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Resize the Video window to a small desktop size, for example by using half size instead of whole or full screen.