Comment 43 for bug 1042211

A bit more information which I again don't know if is helpful.

The desktop effects seem to be generally "slow". For example, maximizing and minimizing windows is very jerky.

However, if I switch from using OpenGL as the "compositing type" in "System Settings" -> "Desktop Effects" -> "Advanced" tab and use XRender instead the effects become much smoother (although a few effects are disabled because they require OpenGL).

Switching to XRender also _seems_ to have gotten rid of the artifacts although I don't have a good way of reliably reproducing them so I can't say for sure.