From b565e29cc67f055bf31d403158cb43c1b69f90a3 Mon Sep 17 00:00:00 2001
From: Luc <89928798+lewcc@users.noreply.github.com>
Date: Thu, 4 Aug 2022 02:50:17 -0700
Subject: [PATCH] Fixes radiation hud (#18703)

---
 code/controllers/subsystem/radiation.dm | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/code/controllers/subsystem/radiation.dm b/code/controllers/subsystem/radiation.dm
index da526e9d869..785aa22ef4e 100644
--- a/code/controllers/subsystem/radiation.dm
+++ b/code/controllers/subsystem/radiation.dm
@@ -8,6 +8,8 @@ PROCESSING_SUBSYSTEM_DEF(radiation)
 	// turf_rad_cache is the state in the current loop, and may not be 100% representative
 	// until processing is complete.
 	// prev_rad_cache is the fully evaluated radiation state cache from the previous tick.
+	var/last_rad_cache_update = 0
+	var/rad_cache_update_interval = 5 SECONDS
 	var/list/turf_rad_cache = list()
 	var/list/prev_rad_cache = list()
 
@@ -25,7 +27,9 @@ PROCESSING_SUBSYSTEM_DEF(radiation)
 	master.investigate_log(msg, "radiation")
 
 /datum/controller/subsystem/processing/radiation/fire(resumed)
-	refresh_rad_cache()
+	if(world.time > last_rad_cache_update + rad_cache_update_interval)
+		refresh_rad_cache()
+		last_rad_cache_update = world.time
 	. = ..()
 
 /datum/controller/subsystem/processing/radiation/proc/get_turf_radiation(turf/place)
@@ -37,12 +41,13 @@ PROCESSING_SUBSYSTEM_DEF(radiation)
 /datum/controller/subsystem/processing/radiation/proc/update_rad_cache(datum/component/radioactive/thing)
 	var/atom/owner = thing.parent
 	var/turf/place = get_turf(owner)
-	if (turf_rad_cache[place])
+	if(turf_rad_cache[place])
 		turf_rad_cache[place] += thing.strength
 	else
 		turf_rad_cache[place] = thing.strength
 
 
 /datum/controller/subsystem/processing/radiation/proc/refresh_rad_cache()
-	prev_rad_cache = turf_rad_cache.Copy()
+	prev_rad_cache.Cut()
+	prev_rad_cache = turf_rad_cache
 	turf_rad_cache = list()