2011 iMac performance/graphic problem!

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so got imac in may , working beautifully, kerp extreme clean, nothing on desktop, 1 application running @ time, etc etc - play starcraft 2 , lately after few game computer starts hiccup , slow down graphics wise , processing wise in general, itll freeze 5 seconds move hiccup etc - everythingbelse on comp wirks fine safari blah blah thisbis starting worry me ehy happening?
 

the is..... have warranty..... use :apple:
 


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