Feral Interactive have put out a big update to their 'GameMode' Linux gaming performance tool
Planetary
They've just announced the release of GameMode 1.3, which adds in a bunch of pretty useful features including: disabling the screen-saver, a "gamemoderun" helper script to do the necessary setup (set LD_PRELOAD) to enable GameMode on games which do not support it themselves and increase I/O priority of game processes.
