Heres the trick on how to compile huge, gigantic, big, R_speed consuming maps in less than 30 seconds!
*note, only for source mappers!
the trick is: NO LIGHTS, no bright-giving entity, no whatsover that emits lights.
besides its gonna be set to mat_fullbright 1 anyways.
so use this technique when mapping and editing beta levels
*ONLY PUT LIGHTS WHEN MAP IS 100% DONE!!*