Gentoo vs. Ubuntu performance comparison
LinuxMag has made a performance comparison of Gentoo at various gcc optimization levels against the previous release of Ubuntu (9.04).
The X11 and 3D performance comparison is not meaningful, as they compare different versions of the NVidia proprietary driver. But other benchmarks are quite interesting.
Of course the decision for or against Gentoo is not primarily due to performance, as the commenters point out.
Originally Posted by http://www.linux-mag.com/id/7574/3/