After my heatsink replacement...anyone else having this problem?

I just got my Blackbook back on Monday after getting the heatsink replaced due to RSD's (as an aside, Apple's turnaround time was blazing fast, I was without my computer for only 5 days). The RSD's are gone thankfully, but my computer is running noticeably slower. I only have 512MB of RAM, but I am getting the Rainbow Beachball when I try to do simple things like open Firefox. I'm a student so I'm not running anything major like Photoshop, Microsoft Office is the biggest program I use. Often I cant be on instant messenger and Firefox at the same time, and certainly not with Office running unless I want to wait forever.
Is anyone else having this issue? Would simply upgrading my RAM (which I plan on doing) fix the problem, or is there something else that may be sapping my processor?

Upgrading the RAM is going to make a significant difference. I wouldn't hesitate, if I were you - at least 1GB. If you plan later to go to 2GB, get a 1GB chip and throw it in there with one of the 256MB chips. I think you'll be pleasantly surprised.
EDIT: Oops... forgot the other part of the question. Are you running anything else in the background (like Dashboard with a whole bunch of widgets)? Check the Activity Monitor (Applications > Utilities > Application Monitor) to see what's running and taking up your system resources.

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