>>Actually I used Firefox until IE7 came out, and then I switched back. The only thing that Firefox had that I missed in IE were tabbed groups. I run AVG and see no slowdowns at all. Very quick. But I have really good utilities to keep everything nice and clean too, so maybe that makes a difference.
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>FireFox also remembers last session, which IE doesn't.
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>My home PC is a bit old and sometimes some weird processes are starting and slow everything down tremendeously. The applications become unresponsive at that point and I even have to kill them or wait...

It's tough when things start accumulating and you don't even now where. I run AVG (great!) and use some disk/registry utilities and also some stuff that really gets rid of that application that you think you removed, but Windows really didn't do all the way. I also regularly run defrag, which makes a fair difference.