diff --git a/code/__HELPERS/unsorted.dm b/code/__HELPERS/unsorted.dm
index 48787430a0..aab766f9e4 100644
--- a/code/__HELPERS/unsorted.dm
+++ b/code/__HELPERS/unsorted.dm
@@ -491,17 +491,26 @@ Turf and target are separate in case you want to teleport some distance from a t
 	var/y=arcsin(x/sqrt(1+x*x))
 	return y
 
-/atom/proc/GetAllContents()
+/atom/proc/GetAllContents(list/ignore_typecache)
 	var/list/processing_list = list(src)
 	var/list/assembled = list()
+	if(ignore_typecache)		//If there's a typecache, use it.
+		while(processing_list.len)
+			var/atom/A = processing_list[1]
+			processing_list -= A
+			if(ignore_typecache[A.type])
+				continue
+			processing_list |= (A.contents - assembled)
+			assembled |= A
 
-	while(processing_list.len)
-		var/atom/A = processing_list[1]
-		processing_list -= A
+	else		//If there's none, only make this check once for performance.
+		while(processing_list.len)
+			var/atom/A = processing_list[1]
+			processing_list -= A
 
-		processing_list |= (A.contents - assembled)
+			processing_list |= (A.contents - assembled)
 
-		assembled |= A
+			assembled |= A
 
 	return assembled
 
diff --git a/code/game/turfs/turf.dm b/code/game/turfs/turf.dm
index a75823701a..b204406d05 100644
--- a/code/game/turfs/turf.dm
+++ b/code/game/turfs/turf.dm
@@ -77,6 +77,7 @@
 		return
 	SSair.remove_from_active(src)
 	visibilityChanged()
+	QDEL_LIST(blueprint_data)
 	initialized = FALSE
 	requires_activation = FALSE
 	..()
@@ -224,9 +225,15 @@
 	var/old_affecting_lights = affecting_lights
 	var/old_lighting_object = lighting_object
 	var/old_corners = corners
+ 
+	var/old_exl = explosion_level
+	var/old_exi = explosion_id
+	var/old_bp = blueprint_data
+	blueprint_data = null
 
 	var/old_baseturf = baseturf
 	changing_turf = TRUE
+
 	qdel(src)	//Just get the side effects and call Destroy
 	var/turf/W = new path(src)
 
@@ -235,9 +242,14 @@
 	else
 		W.baseturf = old_baseturf
 
+	W.explosion_id = old_exi
+	W.explosion_level = old_exl
+
 	if(!defer_change)
 		W.AfterChange(ignore_air)
 
+	W.blueprint_data = old_bp
+ 
 	if(SSlighting.initialized)
 		recalc_atom_opacity()
 		lighting_object = old_lighting_object
@@ -432,27 +444,24 @@
 	I.setDir(AM.dir)
 	I.alpha = 128
 
-	if(!blueprint_data)
-		blueprint_data = list()
-	blueprint_data += I
+	LAZYADD(blueprint_data, I)
 
 
 /turf/proc/add_blueprints_preround(atom/movable/AM)
 	if(!SSticker.HasRoundStarted())
 		add_blueprints(AM)
 
-/turf/proc/empty(turf_type=/turf/open/space, baseturf_type, delmobs = TRUE, forceop = FALSE)
+/turf/proc/empty(turf_type=/turf/open/space, baseturf_type, list/ignore_typecache, forceop = FALSE)
 	// Remove all atoms except observers, landmarks, docking ports
 	var/static/list/ignored_atoms = typecacheof(list(/mob/dead, /obj/effect/landmark, /obj/docking_port, /atom/movable/lighting_object))
-	var/list/allowed_contents = typecache_filter_list_reverse(GetAllContents(),delmobs? ignored_atoms : ignored_atoms + typecacheof(list(/mob)))
+	var/list/allowed_contents = typecache_filter_list_reverse(GetAllContents(ignore_typecache), ignored_atoms)
 	allowed_contents -= src
 	for(var/i in 1 to allowed_contents.len)
 		var/thing = allowed_contents[i]
 		qdel(thing, force=TRUE)
-		
 
 	var/turf/newT = ChangeTurf(turf_type, baseturf_type, FALSE, FALSE, forceop = forceop)
-    
+
 	SSair.remove_from_active(newT)
 	newT.CalculateAdjacentTurfs()
 	SSair.add_to_active(newT,1)
@@ -537,4 +546,4 @@
 			limit--
 		else
 			return I
-	return I
\ No newline at end of file
+	return I
diff --git a/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm b/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm
index b93b3630e9..24b75a3a9a 100644
--- a/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm
+++ b/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm
@@ -20,26 +20,34 @@
 /datum/mapGeneratorModule/bottomLayer/massdelete
 	spawnableAtoms = list()
 	spawnableTurfs = list()
-	var/deletemobs = TRUE
-	var/deleteturfs = TRUE
+	var/deleteturfs = TRUE	//separate var for the empty type.
+	var/list/ignore_typecache
 
 /datum/mapGeneratorModule/bottomLayer/massdelete/generate()
 	if(!mother)
 		return
 	for(var/V in mother.map)
 		var/turf/T = V
-		T.empty(deleteturfs? null : T.type, delmobs = deletemobs, forceop = TRUE)
+		T.empty(deleteturfs? null : T.type, ignore_typecache = ignore_typecache, forceop = TRUE)
 
-/datum/mapGeneratorModule/bottomLayer/massdelete/no_delete_mobs
-	deletemobs = FALSE
+/datum/mapGeneratorModule/bottomLayer/massdelete/no_delete_mobs/New()
+	..()
+	ignore_typecache = typecacheof(list(/mob))
 
 /datum/mapGeneratorModule/bottomLayer/massdelete/leave_turfs
 	deleteturfs = FALSE
 
+/datum/mapGeneratorModule/bottomLayer/massdelete/leave_turfs/New()
+	..()
+	ignore_typecache = typecacheof(list(/turf))
+
 /datum/mapGeneratorModule/bottomLayer/massdelete/regeneration_delete
-	deletemobs = FALSE
 	deleteturfs = FALSE
 
+/datum/mapGeneratorModule/bottomLayer/massdelete/regeneration_delete/New()
+	..()
+	ignore_typecache = typecacheof(list(/mob, /turf))
+
 //Only places atoms/turfs on area borders
 /datum/mapGeneratorModule/border
 	clusterCheckFlags = CLUSTER_CHECK_NONE