Replaced the critter AI recursion with a proper loop, this seems to have fixed profiling.

code/modules/critters/critter_AI.dm

@@ -8,6 +8,10 @@
 	process()
 		set background = 1
 		if (!src.alive)	return
+
+		// use a loop to avoid weird benchmarking phenomenons caused by
+		// recursion
+		while(1)
 			switch(task)
 				if("thinking")
 					src.attack = 0
@@ -80,9 +84,7 @@
 						icon_state = initial(icon_state)
 					patrol_step()
 					sleep(wanderspeed)
-		spawn(8)
-			process()
-		return
+			sleep(8)
 
 
 	patrol_step()