Actually, I've only ever heard people cite control and customization as reasons for using Gentoo and never have I seen performance benchmarks given consideration outside the odd magazine article. People who focus on the compilation issue and potential speed benefits in consequence tend to be Gentoo detractors, as it seems to play out again here. For my control-freak part, souce-based distributions are all about control, customization, and exclusion of as much horrifying backdoored and inscrutible and braindead software as possible as easily as it can be done. Gentoo counts among the pioneering projects that aim at giving computer owners a real say in what and how their machines run.