Ubuntu MATE: Fixing ALT + TAB being really slow
On my Ubuntu MATE machine, switching applications with ALT + TAB was impossible, because it took nearly 2 seconds. The culprit appears to be an "UX improvement" gone bad: MATE renders a live screenshot of each running application inside the application switcher.
Fixing this is simple:
- Open "Window Preferences"
- Either uncheck "Enable software compositing window manager" or check "Disable thumbnails in Alt-Tab"