Quicktime X is incredibly slow and previews take forever to load

Quicktime takes forever to load an MKV (Perian installed), but also takes its sweet time with other longer vidoes. Finder Previews (off to the side in column view) take forever to load, with QTserver (I think that's the process) taking up huge cpu resources while doing so.
I want to love Quicktime, I really do. It looks great. But its performance is just utterly frustrating at times. I don't know what happened but I never had these problems with Quicktime 7.
Why the does Quicktime behave like this?

http://arstechnica.com/apple/reviews/2009/08/mac-os-x-10-6.ars/6#qtkit
You don't have to use the X version of QuickTime on your Snow Leopard machine. You can use QuickTime Player 7.6.3 if you like.

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Quicktime X is incredibly slow and previews take forever to load

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