d81dcd13e4
This avoids overwhelming the GPU with trying to update mipmaps at a high rate. Because doing so could easily cause a reduction in the compositor frame rate and thus actually reduce visual quality. In the case of a window that is constantly animating in the overview, this reduces mutter's render time by around 20%-30%. (cherry picked from commit c9c32835409046556148d850796210c605ad9998)