Mb pro screen jumps during expose

whenever i enter expose or switch screens on my laptop, the screen jitters or lags. part of the screen will flow through, but the other part will stop and then show up where it should be. or sometimes it'll just go straight from full screen to expose with no animation in between. it just started today and the last time this happend, i needed to get my hard drive replaced. i bought it as a refurb from the apple website and have only had it for maybe a year and a half. is there something that needs to be done to it? it's fully updated and is an asset to me for grad school.

MacBook Pro 15" Mid 2010 owners
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