diff --git a/.vscode/launch.json b/.vscode/launch.json
index e01beb7171..39f599fd9c 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -7,6 +7,13 @@
       "name": "Launch DreamSeeker",
       "preLaunchTask": "Build All",
       "dmb": "${workspaceFolder}/${command:CurrentDMB}"
+    },
+		{
+      "type": "byond",
+      "request": "launch",
+      "name": "Launch DreamSeeker (TRACY)",
+      "preLaunchTask": "Build All (TRACY)",
+      "dmb": "${workspaceFolder}/${command:CurrentDMB}"
     },
     {
       "type": "byond",
@@ -45,6 +52,13 @@
       "preLaunchTask": "Build All (LOWMEMORYMODE)",
       "dmb": "${workspaceFolder}/${command:CurrentDMB}",
       "dreamDaemon": true
+    },
+		{
+      "type": "byond",
+      "request": "launch",
+      "name": "Launch DreamSeeker (LOWMEMORYMODE + TRACY)",
+      "preLaunchTask": "Build All (LOWMEMORYMODE TRACY)",
+      "dmb": "${workspaceFolder}/${command:CurrentDMB}"
     }
   ]
 }
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 155c69ee99..5c8886b0c9 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -24,6 +24,31 @@
 			"dependsOn": "dm: reparse",
 			"label": "Build All"
 		},
+		{
+			"type": "process",
+			"command": "tools/build/build",
+			"windows": {
+				"command": ".\\tools\\build\\build.bat"
+			},
+			"options": {
+				"env": {
+					"DM_EXE": "${config:dreammaker.byondPath}"
+				}
+			},
+			"problemMatcher": [
+				"$dreammaker",
+				"$tsc",
+				"$eslint-stylish"
+			],
+			"group": {
+				"kind": "build"
+			},
+			"dependsOn": "dm: reparse",
+			"args": [
+				"-DUSE_BYOND_TRACY"
+			],
+			"label": "Build All (TRACY)"
+		},
 		{
 			"type": "process",
 			"command": "tools/build/build",
@@ -74,6 +99,32 @@
 			],
 			"label": "Build All (LOWMEMORYMODE)"
 		},
+		{
+			"type": "process",
+			"command": "tools/build/build",
+			"windows": {
+				"command": ".\\tools\\build\\build.bat"
+			},
+			"options": {
+				"env": {
+					"DM_EXE": "${config:dreammaker.byondPath}"
+				}
+			},
+			"problemMatcher": [
+				"$dreammaker",
+				"$tsc",
+				"$eslint-stylish"
+			],
+			"group": {
+				"kind": "build"
+			},
+			"dependsOn": "dm: reparse",
+			"args": [
+				"-DLOWMEMORYMODE",
+				"-DUSE_BYOND_TRACY"
+			],
+			"label": "Build All (LOWMEMORYMODE TRACY)"
+		},
 		{
 			"type": "dreammaker",
 			"dme": "tgstation.dme",
diff --git a/code/_compile_options.dm b/code/_compile_options.dm
index 1ed2075537..ef9692d2a3 100644
--- a/code/_compile_options.dm
+++ b/code/_compile_options.dm
@@ -45,6 +45,10 @@
 
 //#define UNIT_TESTS //If this is uncommented, we do a single run though of the game setup and tear down process with unit tests in between
 
+// If this is uncommented, will attempt to load and initialize prof.dll/libprof.so.
+// We do not ship byond-tracy. Build it yourself here: https://github.com/mafemergency/byond-tracy/
+//#define USE_BYOND_TRACY
+
 #ifndef PRELOAD_RSC //set to:
 #define PRELOAD_RSC 2 // 0 to allow using external resources or on-demand behaviour;
 #endif // 1 to use the default behaviour;
diff --git a/code/controllers/master.dm b/code/controllers/master.dm
index b6fb14a695..e695b0fd0b 100644
--- a/code/controllers/master.dm
+++ b/code/controllers/master.dm
@@ -292,7 +292,8 @@ GLOBAL_REAL(Master, /datum/controller/master) = new
 		SS.state = SS_IDLE
 		if (SS.flags & SS_TICKER)
 			tickersubsystems += SS
-			timer += world.tick_lag * rand(1, 5)
+			// Timer subsystems aren't allowed to bunch up, so we offset them a bit
+			timer += world.tick_lag * rand(0, 1)
 			SS.next_fire = timer
 			continue
 
@@ -371,14 +372,16 @@ GLOBAL_REAL(Master, /datum/controller/master) = new
 			var/checking_runlevel = current_runlevel
 			if(cached_runlevel != checking_runlevel)
 				//resechedule subsystems
+				var/list/old_subsystems = current_runlevel_subsystems
 				cached_runlevel = checking_runlevel
 				current_runlevel_subsystems = runlevel_sorted_subsystems[cached_runlevel]
-				var/stagger = world.time
-				for(var/I in current_runlevel_subsystems)
-					var/datum/controller/subsystem/SS = I
-					if(SS.next_fire <= world.time)
-						stagger += world.tick_lag * rand(1, 5)
-						SS.next_fire = stagger
+
+				//now we'll go through all the subsystems we want to offset and give them a next_fire
+				for(var/datum/controller/subsystem/SS as anything in current_runlevel_subsystems)
+					//we only want to offset it if it's new and also behind
+					if(SS.next_fire > world.time || (SS in old_subsystems))
+						continue
+					SS.next_fire = world.time + world.tick_lag * rand(0, DS2TICKS(min(SS.wait, 2 SECONDS)))
 
 			subsystems_to_check = current_runlevel_subsystems
 		else
diff --git a/code/game/turfs/simulated/openspace.dm b/code/game/turfs/simulated/openspace.dm
index 935bfdc1a7..4ee865983e 100644
--- a/code/game/turfs/simulated/openspace.dm
+++ b/code/game/turfs/simulated/openspace.dm
@@ -38,7 +38,7 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 
 /turf/open/openspace/Initialize(mapload) // handle plane and layer here so that they don't cover other obs/turfs in Dream Maker
 	. = ..()
-	vis_contents += GLOB.openspace_backdrop_one_for_all //Special grey square for projecting backdrop darkness filter on it.
+	overlays += GLOB.openspace_backdrop_one_for_all //Special grey square for projecting backdrop darkness filter on it.
 	return INITIALIZE_HINT_LATELOAD
 
 /turf/open/openspace/LateInitialize()
diff --git a/code/game/world.dm b/code/game/world.dm
index c6a5a2ef95..4ca2259e50 100644
--- a/code/game/world.dm
+++ b/code/game/world.dm
@@ -14,6 +14,11 @@ GLOBAL_LIST(topic_status_cache)
 		LIBCALL(dll, "auxtools_init")()
 		enable_debugging()
 
+#ifdef USE_BYOND_TRACY
+	#warn USE_BYOND_TRACY is enabled
+	init_byond_tracy()
+#endif
+
 	world.Profile(PROFILE_START)
 	log_world("World loaded at [TIME_STAMP("hh:mm:ss", FALSE)]!")
 
@@ -369,3 +374,19 @@ GLOBAL_LIST(topic_status_cache)
 
 /world/proc/on_tickrate_change()
 	SStimer?.reset_buckets()
+
+/world/proc/init_byond_tracy()
+	var/library
+
+	switch (system_type)
+		if (MS_WINDOWS)
+			library = "prof.dll"
+		if (UNIX)
+			library = "libprof.so"
+		else
+			CRASH("Unsupported platform: [system_type]")
+
+	var/init_result = call_ext(library, "init")("block")
+	if (init_result != "0")
+		CRASH("Error initializing byond-tracy: [init_result]")
+
diff --git a/code/modules/antagonists/slaughter/slaughterevent.dm b/code/modules/antagonists/slaughter/slaughterevent.dm
index 9b62de57bf..8d1f92faac 100644
--- a/code/modules/antagonists/slaughter/slaughterevent.dm
+++ b/code/modules/antagonists/slaughter/slaughterevent.dm
@@ -8,6 +8,7 @@
 	category = EVENT_CATEGORY_ENTITIES
 	description = "Spawns a slaughter demon, to hunt by travelling through pools of blood."
 
+/*
 /datum/round_event_control/slaughter/canSpawnEvent()
 	weight = initial(src.weight)
 	var/list/allowed_turf_typecache = typecacheof(/turf/open) - typecacheof(/turf/open/space)
@@ -24,6 +25,7 @@
 		weight += 0.03
 		CHECK_TICK
 	return ..()
+*/
 
 /datum/round_event/ghost_role/slaughter
 	minimum_required = 1
diff --git a/prof.dll b/prof.dll
new file mode 100644
index 0000000000..3182f4dfc7
Binary files /dev/null and b/prof.dll differ