Well certainly pages load faster than FF2 but I can't say same about scrolling
Srolling is still a drag on pages with fixed backgrounds n even with complicated forms or flash embeddings.
FireFox 3 Final Still Has Scrolling Bug • mozillaZine Forums
just try scrolling upward on a dctorrent reply form page n see cpu stats in taskmanager.

On the other hand I would like to recommend a scrolling extension to those having better CPUs -
mozdev.org - smoothwheel: installation
No, this doesn't lower cpu usage but rather increases it a bit. But the sexy smooth page scrolling it provides is certainly worth it.

For those who hate the new address bar history search for reasons like ppl closeby getting detailed glimpses of their bookmarks n history, they can restore previous behaviour by opening " about:config " and setting the value
browser.urlbar.matchOnlyTyped to true.