I set the resolution to 2560 x 1440, which is the native resolution of my monitor. I log out, I log back in, the resolution of the game is set to 2048 x 1535, which my monitor should not support, although it seems to display fine. I set the resolution back to 2560 x 1440, which again lasts until I log out again, and at that resolution, I have fewer pauses for redraws than I have at the resolution the game seems to want to use.