Merge pull request #12365 from MrStonedOne/patch-47

Fixes automatic map change causing lag

code/controllers/subsystem/ticker.dm

@@ -488,4 +488,5 @@ var/datum/subsystem/ticker/ticker
 	//map rotate chance defaults to 75% of the length of the round (in minutes)
 	if (!prob((world.time/600)*config.maprotatechancedelta))
 		return
-	maprotate()
+	spawn(-1) //compiling a map can lock up the mc for 30 to 60 seconds if we don't spawn
+		maprotate()