diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index 5f9aeec42..72536e7cd 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -63,6 +63,10 @@
 #include "r_renderer.h"
 #include "serializer.h"
 
+static TStaticArray<sector_t>	loadsectors;
+static TArray<line_t>		loadlines;
+static TArray<side_t>		loadsides;
+
 
 //==========================================================================
 //
@@ -988,4 +992,20 @@ void G_SerializeLevel(FSerializer &arc, bool hubload)
 
 }
 
+// Create a backup of the map data so the savegame code can toss out all fields that haven't changed in order to reduce processing time and file size.
 
+void P_BackupMapData()
+{
+	loadsectors = level.sectors;
+	loadlines.Resize(numlines);
+	memcpy(&loadlines[0], lines, numlines * sizeof(line_t));
+	loadsides.Resize(numsides);
+	memcpy(&loadsides[0], sides, numsides * sizeof(side_t));
+}
+
+void P_FreeMapDataBackup()
+{
+	loadsectors.Clear();
+	loadlines.Clear();
+	loadsides.Clear();
+}
\ No newline at end of file
diff --git a/src/p_saveg.h b/src/p_saveg.h
index 6c4c74f46..715fd6a19 100644
--- a/src/p_saveg.h
+++ b/src/p_saveg.h
@@ -46,4 +46,7 @@ void P_WriteACSDefereds (FSerializer &);
 
 void G_SerializeLevel(FSerializer &arc, bool hubLoad);
 
+void P_BackupMapData();
+void P_FreeMapDataBackup();
+
 #endif // __P_SAVEG_H__
diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index e03b7ac23..34b6909c9 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -73,6 +73,7 @@
 #include "p_blockmap.h"
 #include "r_utility.h"
 #include "p_spec.h"
+#include "p_saveg.h"
 #ifndef NO_EDATA
 #include "edata.h"
 #endif
@@ -122,10 +123,6 @@ int 			numsegs;
 seg_t*			segs;
 glsegextra_t*	glsegextras;
 
-//int 			numsectors;
-//sector_t*		sectors;
-TArray<sector_t>	loadsectors;
-
 int 			numsubsectors;
 subsector_t*	subsectors;
 
@@ -134,11 +131,9 @@ node_t* 		nodes;
 
 int 			numlines;
 line_t* 		lines;
-TArray<line_t>	loadlines;
 
 int 			numsides;
 side_t* 		sides;
-TArray<side_t>	loadsides;
 
 TArray<zone_t>	Zones;
 
@@ -3431,6 +3426,7 @@ extern polyblock_t **PolyBlockMap;
 
 void P_FreeLevelData ()
 {
+	P_FreeMapDataBackup();
 	interpolator.ClearInterpolations();	// [RH] Nothing to interpolate on a fresh level.
 	Renderer->CleanLevelData();
 	FPolyObj::ClearAllSubsectorLinks(); // can't be done as part of the polyobj deletion process.
@@ -4193,12 +4189,7 @@ void P_SetupLevel (const char *lumpname, int position)
 	MapThingsUserDataIndex.Clear();
 	MapThingsUserData.Clear();
 
-	loadsectors.Resize(level.sectors.Size());
-	memcpy(&loadsectors[0], &level.sectors[0], loadsectors.Size() * sizeof(sector_t));
-	loadlines.Resize(numlines);
-	memcpy(&loadlines[0], lines, numlines * sizeof(line_t));
-	loadsides.Resize(numsides);
-	memcpy(&loadsides[0], sides, numsides * sizeof(side_t));
+	P_BackupMapData();
 
 	if (glsegextras != NULL)
 	{
diff --git a/src/serializer.h b/src/serializer.h
index 4797a4bce..e4dc8f226 100644
--- a/src/serializer.h
+++ b/src/serializer.h
@@ -15,10 +15,6 @@ struct usercmd_t;
 struct FWriter;
 struct FReader;
 
-extern TArray<sector_t>	loadsectors;
-extern TArray<line_t>	loadlines;
-extern TArray<side_t>	loadsides;
-
 inline bool nullcmp(const void *buffer, size_t length)
 {
 	const char *p = (const char *)buffer;
diff --git a/src/tarray.h b/src/tarray.h
index 7e6affb97..5b9752d0f 100644
--- a/src/tarray.h
+++ b/src/tarray.h
@@ -573,6 +573,12 @@ public:
 		this->Array = new T[amount];
 		this->Count = amount;
 	}
+	TStaticArray &operator=(const TStaticArray &other)
+	{
+		Alloc(other.Size());
+		memcpy(Array, other.Array, Count * sizeof(T));
+		return *this;
+	}
 };