Why does my mouse move, then stop, then catch up again?

As I move my mouse, it will suddenly stop and then catch up again.
I'm on 10.7.4 mac mini 2.3gb with 8gb ram, anda second monitor attached to the thundrbolt port.

Open Activity Monitor, Show:>All Processes, sort on CPU%, see if anything using too much CPU% when this happens, click on Memory tab, do you have many Pageouts? Click on the Disk Usage tab, how much free space?
Open Console in Utilities & see if there are any clues or repeating messages when this happens.

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