- Composite manager
  - Don't paint unredirected windows where not necessary.
  - Enable not redirecting certain clients.
  - Redirect override-redirect windows at create in stead of map?

- Speed up window stacking.

- netwm hints
  - _NET_WM_ICON icon/size selection is not entirely correct.
  - _NET_WM_STRUT_PARTIAL handling.
  - More (_NET_WM_USER_TIME ...)?

- Defer border rendering?

- Theme Transparency (pseudotrans)
  - Way slower than it needs to be.