Re: 3D windows hang temporarily on focus change
Ubuntu 10.4 with metacity or openbox exhibits the same issues. Installed two 9500GT meanwhile, setup is otherwise the same.
Happens with VMWare Player too (presumably when it uses some GL context for 3d drawing/passthrough). Especially when toggling fullscreen mode.
Reproducible with all drivers including the newest 256 beta, but running the 10.4-distributed driver for now.
This is bloody annoying.