I really didn’t see any difference in loading times with the trunk builds but I’m waiting until they get most of the bugs out of TraceMonkey (replaces the current SpiderMonkey Java script engine for Firefox) which, I believe, is still turned off by default at the moment, to see if it makes any difference in Firefox loading times. The link above takes you to some initial tests made with TraceMonkey turned on. Strangely enough, when I tried the SunSpider test myself, the current nightly build (at the time) crashed and burned. I’ll try it again sometime and see if I have any better luck.

Chrome loads instantly, something for the Mozilla team to look up to!