Save .996s of init time by not initializing shards rods and coil in every single window, and a one line check in turf/Initialize (#71046)

/obj/machinery/door/window/Initialize lowers by 221.81ms.

/turf/Initialize lowers by 775ms.
vis_contents is stupid man

code/game/atoms.dm

@@ -335,7 +335,10 @@
 
 	orbiters = null // The component is attached to us normaly and will be deleted elsewhere
 
-	LAZYCLEARLIST(overlays)
+	// Checking length(overlays) before cutting has significant speed benefits
+	if (length(overlays))
+		overlays.Cut()
+
 	LAZYNULL(managed_overlays)
 
 	QDEL_NULL(light)

code/game/atoms_movable.dm

@@ -195,7 +195,10 @@
 
 
 	vis_locs = null //clears this atom out of all viscontents
-	vis_contents.Cut()
+
+	// Checking length(vis_contents) before cutting has significant speed benefits
+	if (length(vis_contents))
+		vis_contents.Cut()
 
 /atom/movable/proc/update_emissive_block()
 	if(!blocks_emissive)

code/game/machinery/doors/windowdoor.dm

@@ -22,7 +22,6 @@
 	var/shards = 2
 	var/rods = 2
 	var/cable = 1
-	var/list/debris = list()
 	var/associated_lift = null
 
 /obj/machinery/door/window/Initialize(mapload, set_dir, unres_sides)
@@ -34,12 +33,6 @@
 	if(LAZYLEN(req_access))
 		icon_state = "[icon_state]"
 		base_state = icon_state
-	for(var/i in 1 to shards)
-		debris += new /obj/item/shard(src)
-	if(rods)
-		debris += new /obj/item/stack/rods(src, rods)
-	if(cable)
-		debris += new /obj/item/stack/cable_coil(src, cable)
 
 	if(unres_sides)
 		//remove unres_sides from directions it can't be bumped from
@@ -66,7 +59,6 @@
 
 /obj/machinery/door/window/Destroy()
 	set_density(FALSE)
-	QDEL_LIST(debris)
 	if(atom_integrity == 0)
 		playsound(src, SFX_SHATTER, 70, TRUE)
 	electronics = null
@@ -251,12 +243,18 @@
 
 /obj/machinery/door/window/deconstruct(disassembled = TRUE)
 	if(!(flags_1 & NODECONSTRUCT_1) && !disassembled)
-		for(var/obj/fragment in debris)
-			fragment.forceMove(get_turf(src))
-			transfer_fingerprints_to(fragment)
-			debris -= fragment
+		for(var/i in 1 to shards)
+			drop_debris(new /obj/item/shard(src))
+		if(rods)
+			drop_debris(new /obj/item/stack/rods(src, rods))
+		if(cable)
+			drop_debris(new /obj/item/stack/cable_coil(src, cable))
 	qdel(src)
 
+/obj/machinery/door/window/proc/drop_debris(obj/item/debris)
+	debris.forceMove(loc)
+	transfer_fingerprints_to(debris)
+
 /obj/machinery/door/window/narsie_act()
 	add_atom_colour("#7D1919", FIXED_COLOUR_PRIORITY)
 

code/game/turfs/turf.dm

@@ -117,8 +117,10 @@ GLOBAL_LIST_EMPTY(station_turfs)
 		if(T)
 			T.multiz_turf_new(src, UP)
 
-	// by default, vis_contents is inherited from the turf that was here before
-	vis_contents.Cut()
+	// by default, vis_contents is inherited from the turf that was here before.
+	// Checking length(vis_contents) in a proc this hot has huge wins for performance.
+	if (length(vis_contents))
+		vis_contents.Cut()
 
 	assemble_baseturfs()
 
@@ -204,7 +206,8 @@ GLOBAL_LIST_EMPTY(station_turfs)
 	requires_activation = FALSE
 	..()
 
-	vis_contents.Cut()
+	if (length(vis_contents))
+		vis_contents.Cut()
 
 /// WARNING WARNING
 /// Turfs DO NOT lose their signals when they get replaced, REMEMBER THIS