Quicktime X only uses one core on a C2D

On my mac mini C2D activity monitor shows that quicktime X refuses to use more then one core which makes hd movies look very laggy and bad. What can I do to make it use both cores?

QuickTime itself limits to a single processor/core in most cases.
Worst is that quicktime is slow to render movies.
I hope Apple will rewrite quicktime so it supports Open CL and Grand Central Dispatch.
Kind Regards
Henrik

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