That xor effect was under FVWM too for moving and resizing windows and doing an xor wireframe was MUCH faster than a full repaint. If you had no X11 accelerati

That xor effect was under FVWM too for moving and resizing windows and doing an xor wireframe was MUCH faster than a full repaint. If you had no X11 acceleration (xvesa for instance), that mode was magnitudes faster than watching your whole browser window repaint on a resize lasting more than 3 seconds on a Pentium.