Add notes on throttling, scheduling and atomicity.
Add notes on throttling, scheduling and atomicity.

kwm81/weston,abooij/wayland,udoprog/weston,udoprog/weston,sir-murray/weston,bitfactor/wayland,sir-murray/wayland,tulcod/wayland,jonnylamb/weston,xorgy/weston,krezovic/weston,tulcod/wayland,Gnurou/weston,giucam/weston,bitfactor/wayland,abooij/wayland,sir-murray/weston,Fantu/compositor-spice,eyolfson/wayland,kwm81/weston,Tarnyko/weston-xdg_surface_present,Fantu/compositor-spice,xorgy/weston,sir-murray/wayland,abooij/wayland,eyolfson/weston,Fantu/compositor-spice,eyolfson/wayland,giucam/weston,eyolfson/wayland,eyolfson/weston,mchalupa/wayland,jonnylamb/weston,mchalupa/weston,mchalupa/weston,krezovic/weston,bitfactor/wayland,tulcod/wayland,Gnurou/weston,mchalupa/wayland,sir-murray/wayland,Tarnyko/weston-xdg_surface_present,mchalupa/wayland