[citation][nom]mouettus[/nom]ppl are being anal with the performance. I mean... we all have fast PCs. bottleneck is the network connection (internet). I've tried them all on 3 different OSes and can't see turd as far as performance goes.[/citation]
If you're truely using your browser a lot, you will notice differences in speed as well as other things.
For instance my old mother is using both chrome and internet explorer. Some things she does on her laptop run considerably better in chrome, and others do not. An example would be a lot of the flash based content she uses, which just runs very very very poorly in internet explorer. However, other sites require internet explorer to even work, thus neither is perfect.
Personally I have both ie, chrome and firefox. I never liked the counterintuitive firefox layout though, and only have it for the sql express addon.
@ work we only support internet explorer, as it is the only browser with activex support natively (ie without ietab for chrome and firefox). Neither webmail, nor our intranet or registration system works properly in other browsers.