Adds caching to dummy objects, seems to work great.

code/modules/mob/living/carbon/metroid/metroid.dm

@@ -700,10 +700,15 @@ mob/living/carbon/metroid/var/temperature_resistance = T0C+75
 			health = 150
 		stat = 0
 
-
 /mob/living/carbon/metroid/proc/get_obstacle_ok(atom/A)
 	var/direct = get_dir(src, A)
-	var/obj/item/weapon/dummy/D = new /obj/item/weapon/dummy( src.loc )
+	var/obj/item/weapon/dummy/D = locate() in DummyCache //See atom_procs.dm
+	if(!D)
+		D = new /obj/item/weapon/dummy( src.loc )
+	else
+		D.loc = src.loc
+		DummyCache.Remove(D)
+
 	var/ok = 0
 
 	if ( (direct - 1) & direct)
@@ -781,7 +786,8 @@ mob/living/carbon/metroid/var/temperature_resistance = T0C+75
 					if(!border_obstacle.CanPass(D, D.loc, 1, 0))
 						ok = 0
 
-	del(D)
+	D.loc = null
+	DummyCache.Add(D)
 	if (!( ok ))
 		return 0
 

code/modules/recycling/disposal.dm

@@ -502,22 +502,6 @@
 			H.vent_gas(loc)
 			del(H)
 
-	CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
-		if (istype(mover,/obj/item) && mover.throwing)
-			var/obj/item/I = mover
-			if(istype(I, /obj/item/weapon/dummy) || istype(I, /obj/item/projectile))
-				return
-			if(prob(75))
-				I.loc = src
-				for(var/mob/M in viewers(src))
-					M.show_message("\the [I] lands in \the [src].", 3)
-			else
-				for(var/mob/M in viewers(src))
-					M.show_message("\the [I] bounces off of \the [src]'s rim!", 3)
-			return 0
-		else
-			return ..()
-
 // virtual disposal object
 // travels through pipes in lieu of actual items
 // contents will be items flushed by the disposal