Video content freezes for a certain amount of time on Lion

After upgrading to Lion, I have noticed that video content freezes (though the voice is heard, but the picture is frozen for some seconds) for a certain amount of
time when its starts playing (eg youtube videos) on Lion.
I have observed this on my friends macbook pro also.
I have a macbook (mid 2010 model)

Stats Before playing a video
Stats while playing a video in youtube

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