rithm.
Enabling this option will cause redraw events to redraw only the
portion of the screen which changes rather than the whole screen.
Normally this option should be left enabled, but on X servers with
poor clipping implementations, enabling this feature may actually
result in slower redrawing.

<li><b>Show side-bar images in dialog boxes:</b> Most dialog boxes
have side-bars on the left-hand side with an explanation of that
dialog box.  Unchecking this option will suppress these explanatory
messages res