All Videos on iTunes Choppy

hi. running itunes 10 on macbook 1,1. whenever play video, doesn't matter if it's hd or not, video skipping frames , freezes. after 5 seconds or so, video playback normal. know itunes issue since can play same videos on quicktime fine. don't know if problem before updated itunes, since received laptop. know problem is? thanks.

 

what mac os x version , itunes version run?

 

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