Support xhamster flash videos very choppy (and other adult video sites)

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http://androidforums.com – For some reason most of the videos on xhamster.com (full site) are very choppy. Am using broadband WiFi so bandwidth definitely isn't an issue. Anybody else had this problem and/or is there a solution? Never had this problem with the HTC Desire which is nowhere near as good a phone as my Galaxy S2 so I am very confused. (General)