A lot of perf micro-optimisations (#20188)

* Refactors Investigate Log

* Speedup character loading

* Optimise SSinstancing

* Removes both path images

* Optimises SSdebugview

* CRLF --> LF

* Update config/example/config.toml

code/controllers/configuration/sections/system_configuration.dm

@@ -22,6 +22,8 @@
 	var/list/topic_ip_ratelimit_bypass = list()
 	/// Server instance ID
 	var/instance_id = "paradise_main"
+	/// Do we want to enable instancing stuff at all?
+	var/enable_multi_instance_support = FALSE
 	/// Server internal IP
 	var/internal_ip = "127.0.0.1"
 	/// Are we using an external handler for TOS
@@ -36,6 +38,7 @@
 	CONFIG_LOAD_BOOL(shutdown_on_reboot, data["shutdown_on_reboot"])
 	CONFIG_LOAD_BOOL(is_production, data["is_production"])
 	CONFIG_LOAD_BOOL(external_tos_handler, data["external_tos_handler"])
+	CONFIG_LOAD_BOOL(enable_multi_instance_support, data["enable_multi_instance_support"])
 
 	CONFIG_LOAD_STR(topic_key, data["communications_password"])
 	CONFIG_LOAD_STR(medal_hub_address, data["medal_hub_address"])

code/controllers/subsystem/debugview.dm

@@ -7,6 +7,10 @@ SUBSYSTEM_DEF(debugview)
 	var/list/client/processing = list()
 
 /datum/controller/subsystem/debugview/fire(resumed)
+	// Dont generate text if no one is there to look at it
+	if(!length(processing))
+		return
+
 	// Generate debug text
 	var/list/entries = list()
 	entries += "CPU: [round(world.cpu, 1)] | MCPU: [round(world.map_cpu, 1)] | FPS/TPS: [world.fps] | Clients: [length(GLOB.clients)] | BYOND: [world.byond_version].[world.byond_build]"

code/controllers/subsystem/instancing.dm

@@ -14,7 +14,7 @@ SUBSYSTEM_DEF(instancing)
 		CRASH("SSinstancing was set to init before SSredis. Who broke it?")
 
 	// Dont even bother if we arent connected to redis or the DB
-	if(!SSdbcore.IsConnected() || !SSredis.connected)
+	if(!SSdbcore.IsConnected() || !SSredis.connected || !GLOB.configuration.system.enable_multi_instance_support)
 		flags |= SS_NO_FIRE
 		return ..()
 
@@ -43,6 +43,10 @@ SUBSYSTEM_DEF(instancing)
 	update_playercache()
 
 /datum/controller/subsystem/instancing/proc/execute_command(source, command, list/arguments)
+	// We aint enabled. Dont bother.
+	if(!GLOB.configuration.system.enable_multi_instance_support)
+		return
+
 	var/datum/server_command/SC = registered_commands[command]
 	if(!SC)
 		CRASH("Attempted to execute command with ID '[command]' from [source], but that command didnt exist!")
@@ -58,6 +62,10 @@ SUBSYSTEM_DEF(instancing)
   * Updates the player cache in the DB. Different from heartbeat so we can force invoke it on player operations
   */
 /datum/controller/subsystem/instancing/proc/update_playercache(optional_ckey)
+	// We aint enabled. Dont bother.
+	if(!GLOB.configuration.system.enable_multi_instance_support)
+		return
+
 	// You may be wondering, why the fuck is an "optional ckey" variable here
 	// Well, this is invoked in client/New(), and needs to read from GLOB.clients
 	// However, this proc sleeps, and if you sleep during client/New() once the client is in GLOB.clients, stuff breaks bad
@@ -111,6 +119,10 @@ SUBSYSTEM_DEF(instancing)
   * This is called during world/New() instead of on initialize so it can be done *instantly*
   */
 /datum/controller/subsystem/instancing/proc/seed_data()
+	// We aint enabled. Dont bother.
+	if(!GLOB.configuration.system.enable_multi_instance_support)
+		return
+
 	// We need to seed a lot of keys, so lets just use a key-value-pair-map to do this easily
 	var/list/kvp_map = list()
 	kvp_map["server_name"] = GLOB.configuration.general.server_name // Name of the server
@@ -145,6 +157,10 @@ SUBSYSTEM_DEF(instancing)
   * ckey - The ckey to check if they are logged into another server
   */
 /datum/controller/subsystem/instancing/proc/check_player(ckey)
+	// We aint enabled. Dont bother.
+	if(!GLOB.configuration.system.enable_multi_instance_support)
+		return
+
 	// Please see above rant on L127
 	var/datum/db_query/dbq1 = SSdbcore.NewQuery({"
 		SELECT server_id, key_value FROM instance_data_cache WHERE server_id IN