16-Way Linux OS Performance Comparison
While some Linux distributions will do various customization work to the desktop and other areas of the system, it generally doesn't translate to any real-world performance improvements.
The Gentoo-based Calculate Linux Desktop and Sabayon Linux distributions didn't offer any compelling performance advantages over the non-Gentoo distributions, contrary to some Gentoo users believing it's a magical speed demon.
PCLinuxOS 2013 activates the proprietary Catalyst driver by default, rather than the open-source Radeon Gallium3D stack, which is why that distribution is showing the best OpenGL gaming results.