Bug: everything briefly pauses for a few frames every time geometry information shows

The pause only lasts one or two frames, but it happens consistently whenever I start to move or resize a window. Literally everything else on the screen pauses for a frame or two whenever the geometry information appears. It does not happen when the geometry information disappears, and there is no problem while resizing or moving the window. If I disable the script, the brief pause goes away completely, so I know it has to be from something this script does.

This is mostly only noticeable when I'm playing a game or watching video, because otherwise the pause is too brief to notice anything wrong.