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... Ten second boot? You're using an SSD aren't you.
Sorry, I missed the bit about running Gentoo...
Hate to say it but IMO Gentoo doesn't count. Custom kernels, optimized toolchains, and manually tweaked dependencies are the domain of enthusiasts, not end users; your KDE may be fast, but someone using Kubuntu on a Pentium M machine with a little over a gig of RAM will find it pretty slow.