Removes the datum pool, as it is not performant.

* Creating new objects is cheap, in fact comparable to the cost of getting it out of the pool, so it doesn't help there.
* Placing items in the pool is far more expensive than letting them garbage collect due to the resetting of vars and such.

code/game/objects/items/devices/chameleonproj.dm

@@ -47,7 +47,7 @@
 		qdel(active_dummy)
 		active_dummy = null
 		usr << "<span class='notice'>You deactivate the [src].</span>"
-		var/obj/effect/overlay/T = PoolOrNew(/obj/effect/overlay, get_turf(src))
+		var/obj/effect/overlay/T = new /obj/effect/overlay(get_turf(src))
 		T.icon = 'icons/effects/effects.dmi'
 		flick("emppulse",T)
 		spawn(8) qdel(T)
@@ -55,7 +55,7 @@
 		playsound(get_turf(src), 'sound/effects/pop.ogg', 100, 1, -6)
 		var/obj/O = new saved_item(src)
 		if(!O) return
-		var/obj/effect/dummy/chameleon/C = PoolOrNew(/obj/effect/dummy/chameleon, usr.loc)
+		var/obj/effect/dummy/chameleon/C = new /obj/effect/dummy/chameleon(usr.loc)
 		C.activate(O, usr, saved_icon, saved_icon_state, saved_overlays, src)
 		qdel(O)
 		usr << "<span class='notice'>You activate the [src].</span>"

code/game/objects/items/weapons/extinguisher.dm

@@ -107,7 +107,7 @@
 			spawn(0)
 				if(!src || !reagents.total_volume) return
 
-				var/obj/effect/effect/water/W = PoolOrNew(/obj/effect/effect/water, get_turf(src))
+				var/obj/effect/effect/water/W = new /obj/effect/effect/water(get_turf(src))
 				var/turf/my_target
 				if(a <= the_targets.len)
 					my_target = the_targets[a]

code/game/objects/items/weapons/flamethrower.dm

@@ -86,7 +86,7 @@
 		if(ptank)
 			ptank.loc = T
 			ptank = null
-		PoolOrNew(/obj/item/stack/rods, T)
+		new /obj/item/stack/rods(T)
 		qdel(src)
 		return
 

code/game/objects/items/weapons/grenades/smokebomb.dm

@@ -12,7 +12,7 @@
 
 /obj/item/weapon/grenade/smokebomb/New()
 	..()
-	src.smoke = PoolOrNew(/datum/effect/effect/system/smoke_spread/bad)
+	src.smoke = new /datum/effect/effect/system/smoke_spread/bad()
 	src.smoke.attach(src)
 
 /obj/item/weapon/grenade/smokebomb/Destroy()

code/game/objects/items/weapons/shields.dm

@@ -130,7 +130,7 @@
 	. = ..()
 
 	if(.)
-		var/datum/effect/effect/system/spark_spread/spark_system = PoolOrNew(/datum/effect/effect/system/spark_spread)
+		var/datum/effect/effect/system/spark_spread/spark_system = new /datum/effect/effect/system/spark_spread()
 		spark_system.set_up(5, 0, user.loc)
 		spark_system.start()
 		playsound(user.loc, 'sound/weapons/blade1.ogg', 50, 1)