Security camera console now also caches it' list of cameras.

FUCKING HUGE.

code/game/machinery/camera/camera.dm

@@ -36,6 +36,9 @@
 	wires = new(src)
 	assembly = new(src)
 	assembly.state = 4
+
+	invalidateCameraCache()
+
 	/* // Use this to look for cameras that have the same c_tag.
 	for(var/obj/machinery/camera/C in cameranet.cameras)
 		var/list/tempnetwork = C.network&src.network
@@ -61,6 +64,7 @@
 /obj/machinery/camera/emp_act(severity)
 	if(!isEmpProof())
 		if(prob(100/severity))
+			invalidateCameraCache()
 			stat |= EMPED
 			SetLuminosity(0)
 			kick_viewers()
@@ -71,7 +75,7 @@
 				stat &= ~EMPED
 				cancelCameraAlarm()
 				update_icon()
-			
+				invalidateCameraCache()
 			..()
 
 /obj/machinery/camera/bullet_act(var/obj/item/projectile/P)
@@ -118,7 +122,7 @@
 		destroy()
 
 /obj/machinery/camera/attackby(obj/W as obj, mob/living/user as mob)
-
+	invalidateCameraCache()
 	// DECONSTRUCTION
 	if(isscrewdriver(W))
 		//user << "<span class='notice'>You start to [panel_open ? "close" : "open"] the camera's panel.</span>"
@@ -199,6 +203,7 @@
 		//legacy support, if choice is != 1 then just kick viewers without changing status
 		kick_viewers()
 	else
+		invalidateCameraCache()
 		set_status( !src.status )
 		if (!(src.status))
 			visible_message("\red [user] has deactivated [src]!")
@@ -218,6 +223,7 @@
 
 //Used when someone breaks a camera 
 /obj/machinery/camera/proc/destroy()
+	invalidateCameraCache()
 	stat |= BROKEN
 	kick_viewers()
 	triggerCameraAlarm()
@@ -232,6 +238,7 @@
 /obj/machinery/camera/proc/set_status(var/newstatus)
 	if (status != newstatus)
 		status = newstatus
+		invalidateCameraCache()
 		// now disconnect anyone using the camera
 		//Apparently, this will disconnect anyone even if the camera was re-activated.
 		//I guess that doesn't matter since they couldn't use it anyway?

code/game/machinery/computer/camera.dm

@@ -1,5 +1,8 @@
 //This file was auto-corrected by findeclaration.exe on 25.5.2012 20:42:31
 
+/proc/invalidateCameraCache()
+	for(var/obj/machinery/computer/security/s in world)
+		s.camera_cache = null
 
 /obj/machinery/computer/security
 	name = "security camera monitor"
@@ -10,6 +13,7 @@
 	var/list/network = list("SS13")
 	var/mapping = 0//For the overview file, interesting bit of code.
 	circuit = /obj/item/weapon/circuitboard/security
+	var/camera_cache = null
 
 
 	attack_ai(var/mob/user as mob)
@@ -32,29 +36,46 @@
 
 		data["current"] = null
 
-		var/list/L = list()
-		for (var/obj/machinery/camera/C in cameranet.cameras)
-			if(can_access_camera(C))
-				L.Add(C)
+		if(isnull(camera_cache))
+			var/list/L = list()
+			for (var/obj/machinery/camera/C in cameranet.cameras)
+				if(can_access_camera(C))
+					L.Add(C)
+			camera_sort(L)
 
-		camera_sort(L)
+			var/cameras[0]
+			for(var/obj/machinery/camera/C in L)
+				var/cam[0]
+				cam["name"] = C.c_tag
+				cam["deact"] = !C.can_use()
+				cam["camera"] = "\ref[C]"
+				cam["x"] = C.x
+				cam["y"] = C.y
+				cam["z"] = C.z
 
-		var/cameras[0]
-		for(var/obj/machinery/camera/C in L)
-			var/cam[0]
-			cam["name"] = C.c_tag
-			cam["deact"] = !C.can_use()
-			cam["camera"] = "\ref[C]"
-			cam["x"] = C.x
-			cam["y"] = C.y
-			cam["z"] = C.z
+				cameras[++cameras.len] = cam
 
-			cameras[++cameras.len] = cam
+				if(C == current)
+					data["current"] = cam
+
+				var/list/camera_list = list("cameras" = cameras)
+				camera_cache=list2json(camera_list)
+
+		else
+			if(current)
+				var/cam[0]
+				cam["name"] = current.c_tag
+				cam["deact"] = !current.can_use()
+				cam["camera"] = "\ref[current]"
+				cam["x"] = current.x
+				cam["y"] = current.y
+				cam["z"] = current.z
 
-			if(C == current)
 				data["current"] = cam
+			
 
-		data["cameras"] = cameras
+		if(ui)
+			ui.load_cached_data(camera_cache)
 
 		ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 		if (!ui)
@@ -65,6 +86,7 @@
 			// adding a template with the key "mapHeader" replaces the map header content
 			ui.add_template("mapHeader", "sec_camera_map_header.tmpl")
 
+			ui.load_cached_data(camera_cache)
 			ui.set_initial_data(data)
 			ui.open()
 			ui.set_auto_update(1)