Why is Expose lagging for Snow Leopard only in my account, not in guest account? How do i solve it?

I installed an itunes update and somehow my 'expose' starts to lag, not being as smooth as before. I don't know how this can be linked to me updating itunes but somehow i think it is. Does anyone have a solution to this problem?

Expose requires a lot of system resources and it is posible that you may have a program or programs on your account that are running in the background using a lot of these resources. If you open Activity Monitor and look at the tabs on the bottom and if you click on CPU and Memory and notice that FREE does not have a lot of space than that might be the issue and if you look above that on the charts you may see some apps that are using a lot of these resources and you may wish to close them.
Stephen C.

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