Safari 5.1 HTML5 Video performance issues

Since upgrading to Safari 5.1 i am experiencing performance issues while playing HTML5 videos on Youtube. The video takes ever to load, while loading the whole browser becomes unresponsive, in the end forcing me to close the tab and wait for the broswer to recover on its own.
After upgrading to 5.1 though performance has great improved in general and i am loving it, but this problem with HTML5 Video is quite troubling.
I am using Macbook 5,2 (mid-2009) with NVIDIA 9400M

Go to Safari / Preferences - Extensions. If you have any intstalled, turn that off, quit then relaunch Safari. Try a video.

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So everything was going fine until we got all users to update
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~Lyssa

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I believe you..
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I was just searching for a solution to this exact problem before posting it here myself.
I am also a regulat Coursera student and had managed to watch and hear the HTML5 option videos without problem.
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From Coursera:
Sorry to hear about this, and thank you for letting us know.
We have not had an unusual amount of students reporting issues with the video playback. If its a specific Video, please let us know which one so we can check it. If its the same for all videos on this site, and the problem is slowly getting worse, it sounds like an issue with your browser or cookies and cache.
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(Link to page which lists the following)
Google Chrome (newest)
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Firefox (23)
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Internet Explorer (9 or newer)
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Safari 5.1 HTML5 Video performance issues

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