7.5 breaks playback of QT files

Ever since upgrading to leopard I've had trouble with QT -- mostly with fullscreen playback of files. Now with 7.5 out I decided to see how things were going: they've gotten worse. Fullscreen playback appears to be working just fine with divx files (this wasn't the case before - however after a tip I uninstalled Perian and this seems to have solved that problem) but now actual Quicktime files (.mov, .m4v etc) playback is even worse. It is so choppy that it essentially is showing 1 frame for about 5 seconds and then jumps ahead to a new frame which it will show for five seconds, etc.
Before I was only having issues with .mov files exported from final cut, but now even the iPod ready files I've created playback at an incredibly limited framerate.
This occurs in both QT itself along with iTunes (iTunes is choppy in regular, frozen in fullscreen) but things work just fine in VLC and Frontrow.
Just one more reason for me to absolutely hate Quicktime.

I got that with an encoded H.264 file once, look @ cpu usage and it was through the roof! maxxing everything out. Tried the same file with VLC, no issue whatsoever.
ac3 surround is still broken too. Looks like after the triumph of the new iPhone, QT is yet another defeat I hate to say it. Why can't they get it right?
I hope this helps in diagnosing the issue for you somewhat

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