There is a well documented Intel bug in the kernel (Jaunty, Gloria, and all other distros that use this kernel)
There are a few solutions to try in this thread, read down, if the first solution doesn't help, check out optimize-me's link to the Ubuntu forum solution.
ps: you must be running a lot of apps . . to be using 1.35 gigs of ram??? ( check with the system monitor )
I've got 2 gigs total, with Firefox(x2), dolphin, kde, compiz, etc. and I'm only using 400 megs.
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