diff --git a/code/controllers/subsystems/processing/processing.dm b/code/controllers/subsystems/processing/processing.dm
index c5d6dfa126..ef54b8a4ab 100644
--- a/code/controllers/subsystems/processing/processing.dm
+++ b/code/controllers/subsystems/processing/processing.dm
@@ -9,6 +9,10 @@ SUBSYSTEM_DEF(processing)
 	var/stat_tag = "P" //Used for logging
 	var/list/processing = list()
 	var/list/currentrun = list()
+	var/process_proc = /datum/proc/process
+
+	var/debug_last_thing
+	var/debug_original_process_proc // initial() does not work with procs
 
 /datum/controller/subsystem/processing/stat_entry()
 	..("[stat_tag]:[processing.len]")
@@ -30,6 +34,32 @@ SUBSYSTEM_DEF(processing)
 		if (MC_TICK_CHECK)
 			return
 
+/datum/controller/subsystem/processing/proc/toggle_debug()
+	if(!check_rights(R_DEBUG))
+		return
+
+	if(debug_original_process_proc)
+		process_proc = debug_original_process_proc
+		debug_original_process_proc = null
+	else
+		debug_original_process_proc	= process_proc
+		process_proc = /datum/proc/DebugSubsystemProcess
+
+	to_chat(usr, "[name] - Debug mode [debug_original_process_proc ? "en" : "dis"]abled")
+
+/datum/proc/DebugSubsystemProcess(var/wait, var/times_fired, var/datum/controller/subsystem/processing/subsystem)
+	subsystem.debug_last_thing = src
+	var/start_tick = world.time
+	var/start_tick_usage = world.tick_usage
+	. = call(src, subsystem.debug_original_process_proc)(wait, times_fired)
+
+	var/tick_time = world.time - start_tick
+	var/tick_use_limit = world.tick_usage - start_tick_usage - 100 // Current tick use - starting tick use - 100% (a full tick excess)
+	if(tick_time > 0)
+		crash_with("[log_info_line(subsystem.debug_last_thing)] slept during processing. Spent [tick_time] tick\s.")
+	if(tick_use_limit > 0)
+		crash_with("[log_info_line(subsystem.debug_last_thing)] took longer than a tick to process. Exceeded with [tick_use_limit]%")
+
 /datum/proc/process()
 	set waitfor = 0
 	return PROCESS_KILL