Lighting runs every two ticks.

This has the added benefit of making it more likely lighting moves when the person's tile glide has them at their new tile rather then before they get there.

code/controllers/subsystem/lighting.dm

@@ -11,9 +11,9 @@ var/list/lighting_update_overlays  = list() // List of lighting overlays queued
 
 /datum/subsystem/lighting
 	name = "Lighting"
-	wait = 1
+	wait = 2
 	init_order = 1
-	priority = 25
+	priority = 35
 	flags = SS_TICKER
 
 	var/initialized = FALSE