diff --git a/code/game/machinery/doors/airlock.dm b/code/game/machinery/doors/airlock.dm
index 960bc9c3b50..c929e279d6b 100644
--- a/code/game/machinery/doors/airlock.dm
+++ b/code/game/machinery/doors/airlock.dm
@@ -30,6 +30,9 @@
 	var/electrified_until = 0	// World time when the door is no longer electrified. -1 if it is permanently electrified until someone fixes it.
 	var/main_power_lost_until = 0	 //World time when main power is restored.
 	var/backup_power_lost_until = -1 //World time when backup power is restored.
+	var/electrified_timer = null
+	var/main_power_timer = null
+	var/backup_power_timer = null
 	var/spawnPowerRestoreRunning = 0
 	var/welded = null
 	var/locked = 0
@@ -208,30 +211,17 @@
 	desc = "And they said I was crazy."
 	icon = 'icons/obj/doors/Dooruranium.dmi'
 	mineral = "uranium"
-	var/last_event = 0
+	var/event_step = 20
 
-/obj/machinery/door/airlock/process()
-	// Deliberate no call to parent.
-	if(main_power_lost_until > 0 && world.time >= main_power_lost_until)
-		regainMainPower()
-
-	if(backup_power_lost_until > 0 && world.time >= backup_power_lost_until)
-		regainBackupPower()
-
-	else if(electrified_until > 0 && world.time >= electrified_until)
-		electrify(0)
-
-/obj/machinery/door/airlock/uranium/process()
-	if(world.time > last_event+20)
-		if(prob(50))
-			radiate()
-		last_event = world.time
+/obj/machinery/door/airlock/uranium/New()
 	..()
+	addtimer(src, "radiate", event_step)
 
 /obj/machinery/door/airlock/uranium/proc/radiate()
-	for(var/mob/living/L in range (3,src))
-		L.apply_effect(15,IRRADIATE,0)
-	return
+	if(prob(50))
+		for(var/mob/living/L in range (3,src))
+			L.apply_effect(15,IRRADIATE,0)
+	addtimer(src, "radiate", event_step)
 
 /obj/machinery/door/airlock/plasma
 	name = "plasma airlock"
@@ -338,6 +328,15 @@ About the new airlock wires panel:
 /obj/machinery/door/airlock/Destroy()
 	qdel(wires)
 	wires = null
+	if(main_power_timer)
+		deltimer(main_power_timer)
+		main_power_timer = null
+	if(backup_power_timer)
+		deltimer(backup_power_timer)
+		backup_power_timer = null
+	if(electrified_timer)
+		deltimer(electrified_timer)
+		electrified_timer = null
 	return ..()
 
 /obj/machinery/door/airlock/bumpopen(mob/living/user as mob) //Airlocks now zap you when you 'bump' them open when they're electrified. --NeoFite
@@ -399,10 +398,13 @@ About the new airlock wires panel:
 
 /obj/machinery/door/airlock/proc/loseMainPower()
 	main_power_lost_until = mainPowerCablesCut() ? -1 : world.time + SecondsToTicks(60)
+	if(main_power_lost_until > 0)
+		main_power_timer = addtimer(src, "regainMainPower", SecondsToTicks(60), 1)
 
 	// If backup power is permanently disabled then activate in 10 seconds if possible, otherwise it's already enabled or a timer is already running
 	if(backup_power_lost_until == -1 && !backupPowerCablesCut())
 		backup_power_lost_until = world.time + SecondsToTicks(10)
+		backup_power_timer = addtimer(src, "regainBackupPower", SecondsToTicks(10), 1)
 
 	// Disable electricity if required
 	if(electrified_until && isAllPowerLoss())
@@ -410,12 +412,16 @@ About the new airlock wires panel:
 
 /obj/machinery/door/airlock/proc/loseBackupPower()
 	backup_power_lost_until = backupPowerCablesCut() ? -1 : world.time + SecondsToTicks(60)
+	if(backup_power_lost_until > 0)
+		backup_power_timer = addtimer(src, "regainBackupPower", SecondsToTicks(60), 1)
 
 	// Disable electricity if required
 	if(electrified_until && isAllPowerLoss())
 		electrify(0)
 
 /obj/machinery/door/airlock/proc/regainMainPower()
+	main_power_timer = null
+
 	if(!mainPowerCablesCut())
 		main_power_lost_until = 0
 		// If backup power is currently active then disable, otherwise let it count down and disable itself later
@@ -424,22 +430,28 @@ About the new airlock wires panel:
 		update_icon()
 
 /obj/machinery/door/airlock/proc/regainBackupPower()
+	backup_power_timer = null
+
 	if(!backupPowerCablesCut())
 		// Restore backup power only if main power is offline, otherwise permanently disable
 		backup_power_lost_until = main_power_lost_until == 0 ? -1 : 0
 		update_icon()
 
 /obj/machinery/door/airlock/proc/electrify(var/duration, var/feedback = 0)
+	if(electrified_timer)
+		deltimer(electrified_timer)
+		electrified_timer = null
+	
 	var/message = ""
-	if(src.isWireCut(AIRLOCK_WIRE_ELECTRIFY) && arePowerSystemsOn())
+	if(isWireCut(AIRLOCK_WIRE_ELECTRIFY) && arePowerSystemsOn())
 		message = text("The electrification wire is cut - Door permanently electrified.")
-		src.electrified_until = -1
+		electrified_until = -1
 	else if(duration && !arePowerSystemsOn())
 		message = text("The door is unpowered - Cannot electrify the door.")
-		src.electrified_until = 0
+		electrified_until = 0
 	else if(!duration && electrified_until != 0)
 		message = "The door is now un-electrified."
-		src.electrified_until = 0
+		electrified_until = 0
 	else if(duration)	//electrify door for the given duration seconds
 		if(usr)
 			shockedby += text("\[[time_stamp()]\] - [usr](ckey:[usr.ckey])")
@@ -447,7 +459,8 @@ About the new airlock wires panel:
 		else
 			shockedby += text("\[[time_stamp()]\] - EMP)")
 		message = "The door is now electrified [duration == -1 ? "permanently" : "for [duration] second\s"]."
-		src.electrified_until = duration == -1 ? -1 : world.time + SecondsToTicks(duration)
+		electrified_until = duration == -1 ? -1 : world.time + SecondsToTicks(duration)
+		electrified_timer = addtimer(src, "electrify", SecondsToTicks(duration), 1, 0)
 
 	if(feedback && message)
 		usr << message
@@ -686,23 +699,23 @@ About the new airlock wires panel:
 				usr << text("The electrification wire is cut - Door permanently electrified.")
 			else if(!activate && electrified_until != 0)
 				usr << "The door is now un-electrified."
-				src.electrified_until = 0
+				electrify(0)
 			else if(activate)	//electrify door for 30 seconds
 				shockedby += text("\[[time_stamp()]\][usr](ckey:[usr.ckey])")
 				usr.attack_log += text("\[[time_stamp()]\] <font color='red'>Electrified the [name] at [x] [y] [z]</font>")
 				usr << "The door is now electrified for thirty seconds."
-				src.electrified_until = world.time + SecondsToTicks(30)
+				electrify(30)
 		if("electrify_permanently")
 			if(src.isWireCut(AIRLOCK_WIRE_ELECTRIFY))
 				usr << text("The electrification wire is cut - Cannot electrify the door.")
 			else if(!activate && electrified_until != 0)
 				usr << "The door is now un-electrified."
-				src.electrified_until = 0
+				electrify(0)
 			else if(activate)
 				shockedby += text("\[[time_stamp()]\][usr](ckey:[usr.ckey])")
 				usr.attack_log += text("\[[time_stamp()]\] <font color='red'>Electrified the [name] at [x] [y] [z]</font>")
 				usr << "The door is now electrified."
-				electrified_until = -1
+				electrify(-1)
 		if("open")
 			if(src.welded)
 				usr << text("The airlock has been welded shut!")
diff --git a/code/game/machinery/doors/airlock_control.dm b/code/game/machinery/doors/airlock_control.dm
index 81ea94c6e12..e9e1d03831f 100644
--- a/code/game/machinery/doors/airlock_control.dm
+++ b/code/game/machinery/doors/airlock_control.dm
@@ -9,10 +9,11 @@ obj/machinery/door/airlock
 	var/cur_command = null	//the command the door is currently attempting to complete
 
 obj/machinery/door/airlock/process()
-	..()
-	if (arePowerSystemsOn())
+	if(arePowerSystemsOn() && cur_command)
 		spawn()
 			execute_current_command()
+	else
+		return PROCESS_KILL
 
 obj/machinery/door/airlock/receive_signal(datum/signal/signal)
 	if (!arePowerSystemsOn()) return //no power
@@ -33,8 +34,11 @@ obj/machinery/door/airlock/proc/execute_current_command()
 		return
 
 	do_command(cur_command)
-	if (command_completed(cur_command))
+	if(command_completed(cur_command))
 		cur_command = null
+	else
+		if(!(src in machines))
+			addAtProcessing()
 
 obj/machinery/door/airlock/proc/do_command(var/command)
 	switch(command)
diff --git a/code/game/machinery/doors/brigdoors.dm b/code/game/machinery/doors/brigdoors.dm
index b150723c704..378ea22c6da 100644
--- a/code/game/machinery/doors/brigdoors.dm
+++ b/code/game/machinery/doors/brigdoors.dm
@@ -65,7 +65,6 @@
 // if it's less than 0, open door, reset timer
 // update the door_timer window and the icon
 /obj/machinery/door_timer/process()
-
 	if(stat & (NOPOWER|BROKEN))	return
 	if(timing)
 
@@ -73,22 +72,20 @@
 		// (no seriously there's gotta be a better way to do this)
 		var/timeleft = timeleft()
 		if(timeleft > 1e5)
-			src.releasetime = 0
+			releasetime = 0
 
 
-		if(world.timeofday > src.releasetime)
-			Radio.autosay("Timer has expired. Releasing prisoner.", src.name, "Security", list(src.z))
+		if(world.timeofday > releasetime)
+			Radio.autosay("Timer has expired. Releasing prisoner.", name, "Security", list(z))
 			timer_end() // open doors, reset timer, clear status screen
 			timing = 0
+			. = PROCESS_KILL
 
 		src.updateUsrDialog()
 		src.update_icon()
-
 	else
 		timer_end()
-
-	return
-
+		return PROCESS_KILL
 
 // has the door power situation changed, if so update icon.
 /obj/machinery/door_timer/power_change()
@@ -106,6 +103,8 @@
 
 	// Set releasetime
 	releasetime = world.timeofday + timetoset
+	if(!(src in machines))
+		addAtProcessing()
 
 	for(var/obj/machinery/door/window/brigdoor/door in targets)
 		if(door.density)	continue
diff --git a/code/game/machinery/firealarm.dm b/code/game/machinery/firealarm.dm
index b6fd5a66e1c..113a4f0be9e 100644
--- a/code/game/machinery/firealarm.dm
+++ b/code/game/machinery/firealarm.dm
@@ -142,7 +142,7 @@ FIRE ALARM
 			alarm()
 			time = 0
 			timing = 0
-			processing_objects.Remove(src)
+			processing_objects -= src
 		updateDialog()
 	last_process = world.timeofday
 
@@ -244,9 +244,14 @@ FIRE ALARM
 	else if(href_list["alarm"])
 		alarm()
 	else if(href_list["time"])
+		var/oldTiming = timing
 		timing = text2num(href_list["time"])
 		last_process = world.timeofday
-		processing_objects.Add(src)
+		if(oldTiming != timing)
+			if(timing)
+				processing_objects += src
+			else
+				processing_objects -= src
 	else if(href_list["tp"])
 		var/tp = text2num(href_list["tp"])
 		time += tp