Various Delta Time Fixes (#21871)

Organs were being given ~3 seconds of DT per ~2 seconds of real time,
because they were being hit by Process() TWICE, once during processing
for the "Set of all objects", and again during processing for the "Set
of all mobs". No species was hit harder than this but IPCs, who suffered
from having wildly inconsistent temperature mechanics that seemingly
never matched the expected numbers.

I have actually tested this PR to verify that it works. I even went the
extra mile to more extensively test IPC temperature mechanics to find a
separate bug unrelated to DTs that was causing suit coolers to just
straight up not work at all (space suit or otherwise) on a majority of
all IPC subspecies. I then tested the numbers in the PR for IPC cooling
to verify that things work as intended.

<img width="969" height="623" alt="image"
src="https://github.com/user-attachments/assets/01c3aca7-b436-4e52-86f7-aed847dcba5e"
/>

I also tweaked all the subsystems to have a small performance
improvement.

---------

Signed-off-by: VMSolidus <evilexecutive@gmail.com>

code/controllers/subsystems/processing/obj_tab_items.dm

@@ -12,12 +12,13 @@ PROCESSING_SUBSYSTEM_DEF(obj_tab_items)
 		currentrun = processing.Copy()
 	//cache for sanic speed (lists are references anyways)
 	var/list/current_run = currentrun
+	var/seconds_per_tick = wait * 0.1
 
 	while(current_run.len)
 		var/datum/thing = current_run[current_run.len]
 		if(QDELETED(thing))
 			processing -= thing
-		else if(thing.process(wait * 0.1) == PROCESS_KILL)
+		else if(thing.process(seconds_per_tick) == PROCESS_KILL)
 			// fully stop so that a future START_PROCESSING will work
 			STOP_PROCESSING(src, thing)
 		if (MC_TICK_CHECK)

code/controllers/subsystems/processing/processing.dm

@@ -19,13 +19,13 @@ SUBSYSTEM_DEF(processing)
 		currentrun = processing.Copy()
 	//cache for sanic speed (lists are references anyways)
 	var/list/current_run = currentrun
-
+	var/seconds_per_tick = wait * 0.1
 	while(current_run.len)
 		var/datum/thing = current_run[current_run.len]
 		current_run.len--
 		if(QDELETED(thing))
 			processing -= thing
-		else if(thing.process(wait * 0.1) == PROCESS_KILL)
+		else if(thing.process(seconds_per_tick) == PROCESS_KILL)
 			// fully stop so that a future START_PROCESSING will work
 			STOP_PROCESSING(src, thing)
 		if (MC_TICK_CHECK)

code/controllers/subsystems/processing/tgui.dm

@@ -65,12 +65,13 @@ PROCESSING_SUBSYSTEM_DEF(tgui)
 		src.current_run = all_uis.Copy()
 	// Cache for sanic speed (lists are references anyways)
 	var/list/current_run = src.current_run
+	var/seconds_per_tick = wait * 0.1
 	while(current_run.len)
 		var/datum/tgui/ui = current_run[current_run.len]
 		current_run.len--
 		// TODO: Move user/src_object check to process()
 		if(ui?.user && ui.src_object)
-			ui.process(wait * 0.1)
+			ui.process(seconds_per_tick)
 		else
 			ui.close(0)
 		if(MC_TICK_CHECK)
@@ -212,10 +213,11 @@ PROCESSING_SUBSYSTEM_DEF(tgui)
 	if(!LAZYLEN(src_object?.open_uis))
 		return 0
 	var/count = 0
+	var/seconds_per_tick = wait * 0.1
 	for(var/datum/tgui/ui in src_object.open_uis)
 		// Check if UI is valid.
 		if(ui?.src_object && ui.user && ui.src_object.ui_host(ui.user))
-			INVOKE_ASYNC(ui, TYPE_PROC_REF(/datum/tgui, process), wait * 0.1, TRUE)
+			INVOKE_ASYNC(ui, TYPE_PROC_REF(/datum/tgui, process), seconds_per_tick, TRUE)
 			count++
 	return count
 
@@ -270,9 +272,10 @@ PROCESSING_SUBSYSTEM_DEF(tgui)
 	var/count = 0
 	if(length(user?.tgui_open_uis) == 0)
 		return count
+	var/seconds_per_tick = wait * 0.1
 	for(var/datum/tgui/ui in user.tgui_open_uis)
 		if(isnull(src_object) || ui.src_object == src_object)
-			ui.process(wait * 0.1, force = 1)
+			ui.process(seconds_per_tick, force = 1)
 			count++
 	return count