iMac 20" 2.4 momentary freezing


has had problems new imacs momentarily freezing?
i've noticed in last week or mine has been doing quite bit. when i'm watching video on youtube or scrolling through web page freeze every , 2 seconds , go normal. happens every 10 seconds on youtube video. looking @ activity monitor , says safari using 20% cpu , other process called windowserver seems jump around 35% when i'm scrolling through web pages. normal?

i've noticed when i'm playing counterstrike same thing video settings on medium.
 

this alot worse when using firefox! firefox-bin process goes 75% cpu when scrolling web page.
 


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