I use firefox myself.
But the truth is, no matter what browser you go with they are going to be slower.
They all use to be really really fast. But they have all gotten bigger, bloated. Supporting new standards and new things. HTML5, java script, GPu drawing, games and the list goes on. This is why IE 8 feels faster to you, it doesnt handle crap so it doesnt have as much to do lol
They do this because they know machines can handle it now. But not the old ones. And so they all suffer because these browsers are using up the cpu and memory and now even the video like mad. Browsers are practically mini OS's now lol
But firefox is by far (At least I think) the most customizable. That means it is possible to speed it up like it use to be by disabling all the default crap. There are some guides and I think a few add ons that help with that.
Shane