Kernel scheduling algorithm and X.Org performance

[Alan Cox]

> It takes ages because a lot of the apps are badly written, use APIs that
> don't accelerate

Actually its interesting to show how bad that is. Something I did when
debugging drivers that made me realise how bad XAA was at the job with
modern cards was to hack the driver to use the wrong colours for any
accelerated operation so you could see what was fallback. It's quite
disheartening but also interesting when hacking drivers.