I tried it under xfce with metacity replacing xfwm4 -- everything works fine, so I guess it's xfwm4 indeed.
I also tried the --compositor=off option. This makes the delay much smaller, and almost ignorable -- but it's still there it seems (this was tested on edgy, with the new xfwm4). -- After painting several fast strokes in gimp, whole desktop freezes, not reacting to any clicks for several seconds. https://launchpad.net/bugs/61424 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
