My Mac has started lagging badly whenever I use Flash.

I've got a 2.4 GHz MacBook Pro 7,1 with 4 GB of memory running OS X 10.6.8 and recently it has started lagging severely whenever I open a flash video or game.  I use to never have any problems playing games on my computer or streaming any video, even up to 1080p.
Then, recently, it started lagging whenever I used flash, and it's bad enough that my cursor begins jumping, scrolling is basically impossible, the video only shows a frame every few seconds and it **** near crashes my entire computer.  During these times the % CPU for flash in activity monitor will jump up to over 100. 
This issue has really started to bug me and I've tried everything I can to fix it.  I've downgraded to older versions of flash, uninstalled and reinstalled Google Chrome, done all of the system updates for my computer, but nothing works.  I just wanted to know if there's any way I could fix this to have my computer back in working condition.  Any help would be greatly appreciated.

I am having the same problem, and it's driving me crazy! I have the same macbook as chrispy17, except with Lion. Does anyone know how to fix this?

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