Re: 8400M GS : Low performences
Whilst I wouldn't call compiz stable, I have never seen major performance regressions when using it with the radeon driver in the various versions of compiz. Amusingly it works better with a radeon 9600 than a geforce 8600.
In theory when using compiz things should appear smoother in terms of window management. Firstly texture operations in opengl are more trivial for the gfx card than using uncomposited desktop. As a result less cpu is used when dragging, minimising windows etc.
The major problems with the slowness are due to gtk which depends on decent 2d acceleration. Unfortunately modern cards suck at it (at least in linux). That is why using xgl is faster for owners of 8 series cards.