Browser not responding, often using up 100% CPU

*tl;dr My web browser (and often other programs) freeze and Activity Monitor shows they're using a large amount of memory.*
I've been having performance problems with my MacBook for a few weeks now, with single programs causing my computer to heat up, freeze and make noise. Although I don't know what the cause may be, I've ordered 2 more sticks of RAM that will, hopefully, make things work smoother. But I'm still curious as to what is happening and why.
I'm using Webkit (webkit.org) right now, and yesterday I ran Onyx in an effort to alleviate problems like this, (a poor page ins/page outs ratio, specifically), but that, evidently, may have had the opposite effect. Within the past hour that I've had my computer on, this has happened twice. I have only had Webkit open- no other applications. This has started happening a few weeks after I upgraded to Snow Leopard, perhaps that has something to do with it.
Thanks.
Message was edited by: Sn0

Thanks! I've got to leave the computer for the night, but rest assured I'll try both of your replies and label them accordingly.

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