Not for me it isn't. Browsers seem to vary from computer to computer. Some people I know find IE7 fast to load but for me it is really slow. One used to find FF2 to be faster than anything else but I didn't.
For some reason Opera 9.63 seems best on my box, but that may be because FF3 is running add ons. A friend installed the web dev add on for his FF3 yesterday and found it slowed right down.
Anyway the old Opera was terribly slow for me but the new Opera rocks.