Safari 5.1.2 Youtube HTML5-Video issues

Fullscreen-Button on Youtube doesn't work for HTML5 videos on Youtube in Safari. Also there are problems with the video performance. The process QTKitServer Safari Webcontent has 105% CPU, the whole MacBook is very slow in that moment.
This is only a problem in Safari!
Since three years i use Safari for all my work on the net. But after the upgrade to Lion, this browser has a lot of bugs and getting slower and slower. I think it is time to change the browser. :S

Yes. I have the same problem as well. Watching a video on Youtube and the process called QTKitServer goes above 100%. I haven't figured out why (html 5 or fullscreen or whatever) but I didn't noticed it before.
Macbook, Snow Leopard, Safari 5.1.2 with only the Adblock extension running.

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