I think I have found a solution to this. On my Sony Vaio VPCF11S1E running an nVidia 330M, I did this:
1. Start CompizConfig Settings Manager.
2. Type in "workaround" in the filter text box.
3. Tick "Fix screen updates in XGL with fglrx".
4. Tick "Force synchronization between X and GLX".
I have no idea what these do, but it seems to have solved "jerky/laggy window movement" issue for me in 11.10.
I think I have found a solution to this. On my Sony Vaio VPCF11S1E running an nVidia 330M, I did this:
1. Start CompizConfig Settings Manager.
2. Type in "workaround" in the filter text box.
3. Tick "Fix screen updates in XGL with fglrx".
4. Tick "Force synchronization between X and GLX".
I have no idea what these do, but it seems to have solved "jerky/laggy window movement" issue for me in 11.10.