no more lagging during the transition between working and activity mode
windows 7 aero effect working perfectly under vmware
catalyst version 12.3
virtual desktop movement is quite smooth
Solved laggs/slow windows movement in GNOME3 by adding this line
export CLUTTER_VBLANK=noneinto ~/.profile or into /etc/profile file. Restart X server or reboot system.
ref: ATI Catalyst - ArchWiki.