Choppy streaming issues

just happened recently. noticed my mac was running hot. tech support suggested that it was the battery and i should send it back and they're sending me a new one. so in the mean time i'm running it solely off of AC power without the batter in it. don't know if it's related, but since this i've noticed some extremely choppy audio and video streaming. youtube, myspace music, even internal audio is affected. sign on and sign off notification sounds from adium sound like they're run through a slicer. i've checked my bandwidth and nothing has changed there. any ideas?
p.s. it's much much worse say when i'm playing a youtube vid and i load another page. choppiness seems to minimize once the streaming file is completely loaded. i've shocked the pram, restarted, checked the connection. i'm at a loss. my energy settings have it set to better performance. please help?

that's interesting. i anticipated something like that and went to sys prefs and under energy saver (and also in the tool bar in the battery icon drop down menu) i set it to "better performance". doesn't this adjust the CPU performance?

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