Hi, On my fairly powerful machine (128Mb, Dual 350Mhz processor etc), mozilla takes about 8 seconds to start up (cold cache) or 4 seconds (warm cache). No feedback is given. Naive users, especially those on slower machines, will think the system has ignored the request to start the browser. They will press the mozilla button again and make startup even slower! A simple yet powerful solution is to give mozilla a splash screen. This should be shown immediately before any other processing. It would make the startup feel much faster! See the gimp for a great example of a splashscreen used to good effect.
Unfortunately, this was voted down by mozilla people pretty harshly. The other problem was that it added a software dependency of gtk onto xpcom ( which is the first thing loaded ) and that wasn't acceptable.