Comment 2 for bug 959814

definately connected somehow to skype. I managed to reproduce the bug by making the hidden skype window visible again from the indicator and move it around. afterwards firefox minimized normal but maximized VERY slow.

so the steps are:

1) show the skype window and move it around on the desktop (not across virtual desktops)
2) maximize and minimize firefox multiple times by draging the window to the top and also using the window buttons on the left.

the window management should slow down significantly.