diff --git a/code/__DEFINES/atmospherics.dm b/code/__DEFINES/atmospherics.dm
index f73a74ab19..baf29240c3 100644
--- a/code/__DEFINES/atmospherics.dm
+++ b/code/__DEFINES/atmospherics.dm
@@ -251,6 +251,13 @@
 		out_var += cached_gases[total_moles_id];\
 	}
 
+#ifdef TESTING
+GLOBAL_LIST_INIT(atmos_adjacent_savings, list(0,0))
+#define CALCULATE_ADJACENT_TURFS(T) if (SSadjacent_air.queue[T]) { GLOB.atmos_adjacent_savings[1] += 1 } else { GLOB.atmos_adjacent_savings[2] += 1; SSadjacent_air.queue[T] = 1 }
+#else
+#define CALCULATE_ADJACENT_TURFS(T) SSadjacent_air.queue[T] = 1
+#endif
+
 //Unomos - So for whatever reason, garbage collection actually drastically decreases the cost of atmos later in the round. Turning this into a define yields massively improved performance.
 #define GAS_GARBAGE_COLLECT(GASGASGAS)\
 	var/list/CACHE_GAS = GASGASGAS;\
diff --git a/code/__DEFINES/subsystems.dm b/code/__DEFINES/subsystems.dm
index d4086bc4d9..a4fd695fbf 100644
--- a/code/__DEFINES/subsystems.dm
+++ b/code/__DEFINES/subsystems.dm
@@ -26,10 +26,6 @@
 
 #define TIMER_ID_NULL -1
 
-//For servers that can't do with any additional lag, set this to none in flightpacks.dm in subsystem/processing.
-#define FLIGHTSUIT_PROCESSING_NONE 0
-#define FLIGHTSUIT_PROCESSING_FULL 1
-
 #define INITIALIZATION_INSSATOMS 0	//New should not call Initialize
 #define INITIALIZATION_INNEW_MAPLOAD 2	//New should call Initialize(TRUE)
 #define INITIALIZATION_INNEW_REGULAR 1	//New should call Initialize(FALSE)
@@ -112,10 +108,10 @@
 #define FIRE_PRIORITY_AIR_TURFS		40
 #define FIRE_PRIORITY_DEFAULT		50
 #define FIRE_PRIORITY_PARALLAX		65
-#define FIRE_PRIORITY_FLIGHTPACKS	80
 #define FIRE_PRIORITY_MOBS			100
 #define FIRE_PRIORITY_TGUI			110
 #define FIRE_PRIORITY_TICKER		200
+#define FIRE_PRIORITY_ATMOS_ADJACENCY	300
 #define FIRE_PRIORITY_CHAT			400
 #define FIRE_PRIORITY_OVERLAYS		500
 #define FIRE_PRIORITY_INPUT			1000 // This must always always be the max highest priority. Player input must never be lost.
diff --git a/code/__DEFINES/turf_flags.dm b/code/__DEFINES/turf_flags.dm
index 5ceb6f2e2e..8604a92c01 100644
--- a/code/__DEFINES/turf_flags.dm
+++ b/code/__DEFINES/turf_flags.dm
@@ -3,3 +3,4 @@
 #define CHANGETURF_FORCEOP			4
 #define CHANGETURF_SKIP				8 // A flag for PlaceOnTop to just instance the new turf instead of calling ChangeTurf. Used for uninitialized turfs NOTHING ELSE
 #define CHANGETURF_INHERIT_AIR 16 // Inherit air from previous turf. Implies CHANGETURF_IGNORE_AIR
+#define CHANGETURF_RECALC_ADJACENT 32 //Immediately recalc adjacent atmos turfs instead of queuing.
\ No newline at end of file
diff --git a/code/controllers/subsystem/adjacent_air.dm b/code/controllers/subsystem/adjacent_air.dm
new file mode 100644
index 0000000000..8395eda708
--- /dev/null
+++ b/code/controllers/subsystem/adjacent_air.dm
@@ -0,0 +1,35 @@
+SUBSYSTEM_DEF(adjacent_air)
+	name = "Atmos Adjacency"
+	flags = SS_BACKGROUND
+	runlevels = RUNLEVEL_GAME | RUNLEVEL_POSTGAME
+	wait = 10
+	priority = FIRE_PRIORITY_ATMOS_ADJACENCY
+	var/list/queue = list()
+
+/datum/controller/subsystem/adjacent_air/stat_entry()
+#ifdef TESTING
+	..("P:[length(queue)], S:[GLOB.atmos_adjacent_savings[1]], T:[GLOB.atmos_adjacent_savings[2]]")
+#else
+	..("P:[length(queue)]")
+#endif
+
+/datum/controller/subsystem/adjacent_air/Initialize()
+	while(length(queue))
+		fire(mc_check = FALSE)
+	return ..()
+
+/datum/controller/subsystem/adjacent_air/fire(resumed = FALSE, mc_check = TRUE)
+
+	var/list/queue = src.queue
+
+	while (length(queue))
+		var/turf/currT = queue[1]
+		queue.Cut(1,2)
+
+		currT.ImmediateCalculateAdjacentTurfs()
+
+		if(mc_check)
+			if(MC_TICK_CHECK)
+				break
+		else
+			CHECK_TICK
\ No newline at end of file
diff --git a/code/game/turfs/change_turf.dm b/code/game/turfs/change_turf.dm
index f1c5080c8f..6a055bbd35 100644
--- a/code/game/turfs/change_turf.dm
+++ b/code/game/turfs/change_turf.dm
@@ -15,7 +15,7 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	if(turf_type)
 		var/turf/newT = ChangeTurf(turf_type, baseturf_type, flags)
 		SSair.remove_from_active(newT)
-		newT.CalculateAdjacentTurfs()
+		CALCULATE_ADJACENT_TURFS(newT)
 		SSair.add_to_active(newT,1)
 
 /turf/proc/copyTurf(turf/T)
@@ -140,6 +140,8 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 			newTurf.air = stashed_air
 		SSair.add_to_active(newTurf)
 	else
+		if(ispath(path,/turf/closed))
+			flags |= CHANGETURF_RECALC_ADJACENT
 		return ..()
 
 // Take off the top layer turf and replace it with the next baseturf down
@@ -263,7 +265,10 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 //If you modify this function, ensure it works correctly with lateloaded map templates.
 /turf/proc/AfterChange(flags) //called after a turf has been replaced in ChangeTurf()
 	levelupdate()
-	CalculateAdjacentTurfs()
+	if(flags & CHANGETURF_RECALC_ADJACENT)
+		ImmediateCalculateAdjacentTurfs()
+	else
+		CALCULATE_ADJACENT_TURFS(src)
 
 	//update firedoor adjacency
 	var/list/turfs_to_check = get_adjacent_open_turfs(src) | src
diff --git a/code/game/turfs/open.dm b/code/game/turfs/open.dm
index 833a07c9c3..1730a2ec85 100644
--- a/code/game/turfs/open.dm
+++ b/code/game/turfs/open.dm
@@ -200,7 +200,7 @@
 	update_visuals()
 
 	current_cycle = times_fired
-	CalculateAdjacentTurfs()
+	ImmediateCalculateAdjacentTurfs()
 	for(var/i in atmos_adjacent_turfs)
 		var/turf/open/enemy_tile = i
 		var/datum/gas_mixture/enemy_air = enemy_tile.return_air()
diff --git a/code/game/turfs/turf.dm b/code/game/turfs/turf.dm
index 7fe48365ef..1b2ccda82c 100755
--- a/code/game/turfs/turf.dm
+++ b/code/game/turfs/turf.dm
@@ -62,7 +62,7 @@
 		add_overlay(/obj/effect/fullbright)
 
 	if(requires_activation)
-		CalculateAdjacentTurfs()
+		CALCULATE_ADJACENT_TURFS(src)
 		SSair.add_to_active(src)
 
 	if (light_power && light_range)
@@ -85,7 +85,7 @@
 	return INITIALIZE_HINT_NORMAL
 
 /turf/proc/Initalize_Atmos(times_fired)
-	CalculateAdjacentTurfs()
+	CALCULATE_ADJACENT_TURFS(src)
 
 /turf/Destroy(force)
 	. = QDEL_HINT_IWILLGC
diff --git a/code/modules/atmospherics/environmental/LINDA_system.dm b/code/modules/atmospherics/environmental/LINDA_system.dm
index 1ad899920a..5c6e33a2e8 100644
--- a/code/modules/atmospherics/environmental/LINDA_system.dm
+++ b/code/modules/atmospherics/environmental/LINDA_system.dm
@@ -43,7 +43,7 @@
 /atom/movable/proc/BlockSuperconductivity() // objects that block air and don't let superconductivity act. Only firelocks atm.
 	return FALSE
 
-/turf/proc/CalculateAdjacentTurfs()
+/turf/proc/ImmediateCalculateAdjacentTurfs()
 	var/canpass = CANATMOSPASS(src, src)
 	var/canvpass = CANVERTICALATMOSPASS(src, src)
 	for(var/direction in GLOB.cardinals_multiz)
@@ -107,7 +107,7 @@
 
 /turf/air_update_turf(command = 0)
 	if(command)
-		CalculateAdjacentTurfs()
+		ImmediateCalculateAdjacentTurfs()
 	SSair.add_to_active(src,command)
 
 /atom/movable/proc/move_update_air(turf/T)
diff --git a/code/modules/holodeck/area_copy.dm b/code/modules/holodeck/area_copy.dm
index efe7418e44..5e7d0a08dc 100644
--- a/code/modules/holodeck/area_copy.dm
+++ b/code/modules/holodeck/area_copy.dm
@@ -122,7 +122,7 @@ GLOBAL_LIST_INIT(duplicate_forbidden_vars,list(
 
 	if(toupdate.len)
 		for(var/turf/T1 in toupdate)
-			T1.CalculateAdjacentTurfs()
+			CALCULATE_ADJACENT_TURFS(T1)
 			SSair.add_to_active(T1,1)
 
 
diff --git a/code/modules/power/supermatter/supermatter.dm b/code/modules/power/supermatter/supermatter.dm
index 1b3a2a716c..06d1812ece 100644
--- a/code/modules/power/supermatter/supermatter.dm
+++ b/code/modules/power/supermatter/supermatter.dm
@@ -313,7 +313,7 @@ GLOBAL_DATUM(main_supermatter_engine, /obj/machinery/power/supermatter_crystal)
 	playsound(T, 'sound/effects/supermatter.ogg', 50, 1)
 	T.visible_message("<span class='danger'>[T] smacks into [src] and rapidly flashes to ash.</span>",\
 	"<span class='italics'>You hear a loud crack as you are washed with a wave of heat.</span>")
-	T.CalculateAdjacentTurfs()
+	CALCULATE_ADJACENT_TURFS(T)
 
 /obj/machinery/power/supermatter_crystal/process_atmos()
 	var/turf/T = loc
diff --git a/tgstation.dme b/tgstation.dme
index 545687805b..89d5cb3a3c 100755
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -224,6 +224,7 @@
 #include "code\controllers\configuration\entries\game_options.dm"
 #include "code\controllers\configuration\entries\general.dm"
 #include "code\controllers\subsystem\acid.dm"
+#include "code\controllers\subsystem\adjacent_air.dm"
 #include "code\controllers\subsystem\air.dm"
 #include "code\controllers\subsystem\air_turfs.dm"
 #include "code\controllers\subsystem\assets.dm"