Choppy video after Quicktime update

Hi there,
I recently updated to Quicktime 7.0.4 because iTunes 6.X required it to work properly. Unfortunately, all of my iMovie HD projects now run very poorly making them hard to edit and review. The movies vary in length from just under 2 minutes to 18 minutes.
I have sufficient RAM and hard disc space so my guess is that this has to do with Quicktime and/or imported music from iTunes. Do I go back to Quicktime 7.0.1 and give up iTunes (kind of unrealistic) or is there another solution. Any help would be greatly appreciated. Thanks
John

I found that I only have this issue with songs in ACC format (songs I've downloaded from iTunes) and not songs in MPEG-1, Layer 3 format (songs I've copied from old CDs I own or have converted). I converted the ACC songs to MPEG-1, Layer 3 format in iTunes, and the problem is solved. I've tested this with multiple songs and found this solution to work.
I'm not in front of my Mac at this time, but I know I converted the songs to MPEG-1, Layer 3 by burning them to a CD from my library in iTunes. I then set my preferences (it was on the Advanced tab I think) in iTunes to import (I think that was the button) in MPEG format versus ACC (the default). I then re-imported the songs from the CD. Then went to Advanced->Convert to MPEG and converted the songs. That created a second song in my library that was in MPEG format. You can verify that by highlighting the song and going to File->Get Info in iTunes (I think that is the option). Then use MPEG version of the song in iMovie and see if the playback is better. Again, I've tested this multiple times and it has worked for me.

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