Mozilla itself is quite slow, well depending on how you look at it.
But remember Mozilla is not just a browser, it is a whole environment, what we actually want/need is to port the GECKO engine, all the other stuff included in mozilla itself is not of any direct importance.
Believe me, Gecko itself is not that big and really a fast renderer.
Still, i'm tempted to port khtml myself more then porting the gecko engine though. (it has nothing to do with kde/qt, i don't even like that interface/toolkit)
