I just wanted to share my problem and solution.
I have Windows 7 64 bit with 1 GB graphics card and 4 x 23" monitors, 16 GB of memory, and AMD FX 8150 at normal speed, 3.6 GHz.
I was experiencing terrible lag while editing AVCHD video, 1080p. It took about 30 seconds just to select a spot and play. Yes, that terrible.
The fix: Unplug 3 of my monitors! I guess they take up a pretty large amount of the graphics card's memory.
I hope this helps someone.
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