Now, I've gained some discipline and stopped installing 50K plugins, but Firefox has done the heavy lifting here. On FF 15 I only have a small amount of plugins (partially because I abandoned its usage) but on my work Mac, it goes from shutdown to usable in 685ms.
If anyone you know is delusional enough to think that competition doesn't improve products, just point to FF. The existence and popularity of Chrome has turned FF from a decrepit bloatware to a sleek modern web racehorse. I'm proud of those guys because in all honesty, I was convinced they would fail. Kudos.