"Startup time is MUCH improved in Firefox 3.6. Chrome still feels slightly quicker, but we're talking on the order of 100s of milliseconds. For something that I do once a day, at most, the difference is negligible."<p><a href="http://www.websiteoptimization.com/speed/tweak/psychology-web-performance/" rel="nofollow">http://www.websiteoptimization.com/speed/tweak/psychology-we...</a><p>Read the "The Effects of Slow Download Times" section. Those miniscule effects add up big over time, and lead to better overall satisfaction of the service. The link specifically refers to various web services, but I would be extremely surprised if there was not a similar effect in relation between satisfaction and general speediness (UI snappiness, JS/HTML/etc rendering speed) of various browsers.<p>Thats not to say that speed is the only reason to choose a browser, but it likely has more of an effect on how you use your browser (and therefore how you use the internet) than you would be able to consciously discern.