Using an ATI HD3870, fglrx driver and Metacity, I experience the delay with:
- Window minimizing
- Window maximizing
- Window restore
- Workspace switch
This issue does not affect moving windows around as that does not suffer from any delays. Window resize has always been slow but that's a different issue I believe.
Edit: I would also like to point out that during the two second delay, the system is unresponsive and CPU load peaks at 100%.