diff --git a/src/d_main.cpp b/src/d_main.cpp
index ab33bfaec..a24586bc4 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -756,9 +756,9 @@ void D_Display ()
 			}
 			screen->SetBlendingRect(viewwindowx, viewwindowy,
 				viewwindowx + viewwidth, viewwindowy + viewheight);
-			P_PredictPlayer(&players[consoleplayer]);
+
 			Renderer->RenderView(&players[consoleplayer]);
-			P_UnPredictPlayer();
+
 			if ((hw2d = screen->Begin2D(viewactive)))
 			{
 				// Redraw everything every frame when using 2D accel
diff --git a/src/d_net.cpp b/src/d_net.cpp
index 9ba6eefa0..d33f47e38 100644
--- a/src/d_net.cpp
+++ b/src/d_net.cpp
@@ -110,13 +110,15 @@ unsigned int	lastrecvtime[MAXPLAYERS];				// [RH] Used for pings
 unsigned int	currrecvtime[MAXPLAYERS];
 unsigned int	lastglobalrecvtime;						// Identify the last time a packet was recieved.
 bool			hadlate;
+int				netdelay[MAXNETNODES][BACKUPTICS];		// Used for storing network delay times.
+int				lastaverage;
 
 int 			nodeforplayer[MAXPLAYERS];
 int				playerfornode[MAXNETNODES];
 
 int 			maketic;
 int 			skiptics;
-int 			ticdup; 		
+int 			ticdup;
 
 void D_ProcessEvents (void); 
 void G_BuildTiccmd (ticcmd_t *cmd); 
@@ -151,6 +153,32 @@ CUSTOM_CVAR (Bool, cl_capfps, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 	}
 }
 
+CVAR(Bool, net_ticbalance, false, CVAR_SERVERINFO | CVAR_NOSAVE)
+CUSTOM_CVAR(Int, net_extratic, 0, CVAR_SERVERINFO | CVAR_NOSAVE)
+{
+	if (self < 0)
+	{
+		self = 0;
+	}
+	else if (self > 2)
+	{
+		self = 2;
+	}
+}
+
+#ifdef _DEBUG
+CVAR(Int, net_fakelatency, 0, 0);
+
+struct PacketStore
+{
+	int timer;
+	doomcom_t message;
+};
+
+static TArray<PacketStore> InBuffer;
+static TArray<PacketStore> OutBuffer;
+#endif
+
 // [RH] Special "ticcmds" get stored in here
 static struct TicSpecial
 {
@@ -347,6 +375,9 @@ int NetbufferSize ()
 		k += netbuffer[k] + 1;
 	}
 
+	// Network delay byte
+	k++;
+
 	if (netbuffer[0] & NCMD_MULTI)
 	{
 		count = netbuffer[k];
@@ -487,7 +518,30 @@ void HSendPacket (int node, int len)
 	doomcom.remotenode = node;
 	doomcom.datalength = len;
 
-	I_NetCmd ();
+#ifdef _DEBUG
+	if (net_fakelatency / 2 > 0)
+	{
+		PacketStore store;
+		store.message = doomcom;
+		store.timer = I_GetTime(false) + ((net_fakelatency / 2) / (1000 / TICRATE));
+		OutBuffer.Push(store);
+	}
+	else
+		I_NetCmd();
+
+	for (unsigned int i = 0; i < OutBuffer.Size(); i++)
+	{
+		if (OutBuffer[i].timer <= I_GetTime(false))
+		{
+			doomcom = OutBuffer[i].message;
+			I_NetCmd();
+			OutBuffer.Delete(i);
+			i = -1;
+		}
+	}
+#else
+	I_NetCmd();
+#endif
 }
 
 //
@@ -509,12 +563,42 @@ bool HGetPacket (void)
 
 	if (demoplayback)
 		return false;
-				
+
 	doomcom.command = CMD_GET;
 	I_NetCmd ();
+
+#ifdef _DEBUG
+	if (net_fakelatency / 2 > 0 && doomcom.remotenode != -1)
+	{
+		PacketStore store;
+		store.message = doomcom;
+		store.timer = I_GetTime(false) + ((net_fakelatency / 2) / (1000 / TICRATE));
+		InBuffer.Push(store);
+		doomcom.remotenode = -1;
+	}
 	
 	if (doomcom.remotenode == -1)
+	{
+		bool gotmessage = false;
+		for (unsigned int i = 0; i < InBuffer.Size(); i++)
+		{
+			if (InBuffer[i].timer <= I_GetTime(false))
+			{
+				doomcom = InBuffer[i].message;
+				InBuffer.Delete(i);
+				gotmessage = true;
+				break;
+			}
+		}
+		if (!gotmessage)
+			return false;
+	}
+#else
+	if (doomcom.remotenode == -1)
+	{
 		return false;
+	}
+#endif
 		
 	if (debugfile)
 	{
@@ -570,6 +654,9 @@ bool HGetPacket (void)
 
 	if (doomcom.datalength != NetbufferSize ())
 	{
+		Printf("Bad packet length %i (calculated %i)\n",
+			doomcom.datalength, NetbufferSize());
+
 		if (debugfile)
 			fprintf (debugfile,"---bad packet length %i (calculated %i)\n",
 				doomcom.datalength, NetbufferSize());
@@ -782,6 +869,9 @@ void GetPackets (void)
 			}
 		}
 
+		// Pull current network delay from node
+		netdelay[netnode][(nettics[netnode]+1) % BACKUPTICS] = netbuffer[k++];
+
 		playerbytes[0] = netconsole;
 		if (netbuffer[0] & NCMD_MULTI)
 		{
@@ -1150,11 +1240,18 @@ void NetUpdate (void)
 			netbuffer[k++] = lowtic;
 		}
 
-		numtics = lowtic - realstart;
+		numtics = MAX(0, lowtic - realstart);
 		if (numtics > BACKUPTICS)
 			I_Error ("NetUpdate: Node %d missed too many tics", i);
 
-		resendto[i] = MAX (0, lowtic - doomcom.extratics);
+		switch (net_extratic)
+		{
+		case 0:
+		default: 
+			resendto[i] = lowtic; break;
+		case 1: resendto[i] = MAX(0, lowtic - 1); break;
+		case 2: resendto[i] = nettics[i]; break;
+		}
 
 		if (numtics == 0 && resendOnly && !remoteresend[i] && nettics[i])
 		{
@@ -1190,6 +1287,10 @@ void NetUpdate (void)
 			}
 		}
 
+		// Send current network delay
+		// The number of tics we just made should be removed from the count.
+		netbuffer[k++] = ((maketic - newtics - gametic) / ticdup);
+
 		if (numtics > 0)
 		{
 			int l;
@@ -1299,9 +1400,37 @@ void NetUpdate (void)
 			// that it won't adapt. Fortunately, player prediction helps
 			// alleviate the lag somewhat.
 
-			if (NetMode != NET_PacketServer)
+			if (NetMode == NET_PeerToPeer)
 			{
-				mastertics = nettics[nodeforplayer[Net_Arbitrator]];
+				int totalavg = 0;
+				if (net_ticbalance)
+				{
+					// Try to guess ahead the time it takes to send responses to the slowest node
+					int nodeavg = 0, arbavg = 0;
+
+					for (j = 0; j < BACKUPTICS; j++)
+					{
+						arbavg += netdelay[nodeforplayer[Net_Arbitrator]][j];
+						nodeavg += netdelay[0][j];
+					}
+					arbavg /= BACKUPTICS;
+					nodeavg /= BACKUPTICS;
+
+					// We shouldn't adapt if we are already the arbitrator isn't what we are waiting for, otherwise it just adds more latency
+					if (arbavg > nodeavg)
+					{
+						lastaverage = totalavg = ((arbavg + nodeavg) / 2);
+					}
+					else
+					{
+						// Allow room to guess two tics ahead
+						if (nodeavg > (arbavg + 2) && lastaverage > 0)
+							lastaverage--;
+						totalavg = lastaverage;
+					}
+				}
+					
+				mastertics = nettics[nodeforplayer[Net_Arbitrator]] + totalavg;
 			}
 			if (nettics[0] <= mastertics)
 			{
@@ -1346,9 +1475,8 @@ void NetUpdate (void)
 //
 //  0 One byte set to NCMD_SETUP+2
 //  1 One byte for ticdup setting
-//  2 One byte for extratics setting
-//  3 One byte for NetMode setting
-//  4 String with starting map's name
+//  2 One byte for NetMode setting
+//  3 String with starting map's name
 //  . Four bytes for the RNG seed
 //  . Stream containing remaining game info
 //
@@ -1429,10 +1557,9 @@ bool DoArbitrate (void *userdata)
 			data->gotsetup[0] = 0x80;
 
 			ticdup = doomcom.ticdup = netbuffer[1];
-			doomcom.extratics = netbuffer[2];
-			NetMode = netbuffer[3];
+			NetMode = netbuffer[2];
 
-			stream = &netbuffer[4];
+			stream = &netbuffer[3];
 			s = ReadString (&stream);
 			startmap = s;
 			delete[] s;
@@ -1497,9 +1624,8 @@ bool DoArbitrate (void *userdata)
 	{
 		netbuffer[0] = NCMD_SETUP+2;
 		netbuffer[1] = (BYTE)doomcom.ticdup;
-		netbuffer[2] = (BYTE)doomcom.extratics;
-		netbuffer[3] = NetMode;
-		stream = &netbuffer[4];
+		netbuffer[2] = NetMode;
+		stream = &netbuffer[3];
 		WriteString (startmap, &stream);
 		WriteLong (rngseed, &stream);
 		C_WriteCVars (&stream, CVAR_SERVERINFO, true);
@@ -1647,15 +1773,23 @@ void D_CheckNetGame (void)
 
 	consoleplayer = doomcom.consoleplayer;
 
-	v = Args->CheckValue ("-netmode");
-	if (v != NULL)
+	if (consoleplayer == Net_Arbitrator)
 	{
-		NetMode = atoi (v) != 0 ? NET_PacketServer : NET_PeerToPeer;
-	}
-	if (doomcom.numnodes > 1)
-	{
-		Printf ("Selected " TEXTCOLOR_BLUE "%s" TEXTCOLOR_NORMAL " networking mode. (%s)\n", NetMode == NET_PeerToPeer ? "peer to peer" : "packet server",
-			v != NULL ? "forced" : "auto");
+		v = Args->CheckValue("-netmode");
+		if (v != NULL)
+		{
+			NetMode = atoi(v) != 0 ? NET_PacketServer : NET_PeerToPeer;
+		}
+		if (doomcom.numnodes > 1)
+		{
+			Printf("Selected " TEXTCOLOR_BLUE "%s" TEXTCOLOR_NORMAL " networking mode. (%s)\n", NetMode == NET_PeerToPeer ? "peer to peer" : "packet server",
+				v != NULL ? "forced" : "auto");
+		}
+
+		if (Args->CheckParm("-extratic"))
+		{
+			net_extratic = 1;
+		}
 	}
 
 	// [RH] Setup user info
@@ -1683,6 +1817,11 @@ void D_CheckNetGame (void)
 	for (i = 0; i < doomcom.numnodes; i++)
 		nodeingame[i] = true;
 
+	if (consoleplayer != Net_Arbitrator && doomcom.numnodes > 1)
+	{
+		Printf("Arbitrator selected " TEXTCOLOR_BLUE "%s" TEXTCOLOR_NORMAL " networking mode.\n", NetMode == NET_PeerToPeer ? "peer to peer" : "packet server");
+	}
+
 	Printf ("player %i of %i (%i nodes)\n",
 			consoleplayer+1, doomcom.numplayers, doomcom.numnodes);
 }
@@ -1809,6 +1948,9 @@ void TryRunTics (void)
 		{
 			C_Ticker();
 			M_Ticker();
+			// Repredict the player for new buffered movement
+			P_UnPredictPlayer();
+			P_PredictPlayer(&players[consoleplayer]);
 		}
 		return;
 	}
@@ -1844,6 +1986,9 @@ void TryRunTics (void)
 		{
 			C_Ticker ();
 			M_Ticker ();
+			// Repredict the player for new buffered movement
+			P_UnPredictPlayer();
+			P_PredictPlayer(&players[consoleplayer]);
 			return;
 		}
 	}
@@ -1857,6 +2002,7 @@ void TryRunTics (void)
 	// run the count tics
 	if (counts > 0)
 	{
+		P_UnPredictPlayer();
 		while (counts--)
 		{
 			if (gametic > lowtic)
@@ -1876,6 +2022,7 @@ void TryRunTics (void)
 
 			NetUpdate ();	// check for new console commands
 		}
+		P_PredictPlayer(&players[consoleplayer]);
 		S_UpdateSounds (players[consoleplayer].camera);	// move positional sounds
 	}
 }
@@ -2713,7 +2860,6 @@ void Net_SkipCommand (int type, BYTE **stream)
 CCMD (pings)
 {
 	int i;
-
 	for (i = 0; i < MAXPLAYERS; i++)
 		if (playeringame[i])
 			Printf ("% 4d %s\n", currrecvtime[i] - lastrecvtime[i],
diff --git a/src/d_net.h b/src/d_net.h
index 4cd3e66f5..07921a301 100644
--- a/src/d_net.h
+++ b/src/d_net.h
@@ -70,7 +70,6 @@ struct doomcom_t
 // info common to all nodes
 	SWORD	numnodes;		// console is always node 0.
 	SWORD	ticdup;			// 1 = no duplication, 2-5 = dup for slow nets
-	SWORD	extratics;		// 1 = send a backup tic in every packet
 #ifdef DJGPP
 	SWORD	pad[5];			// keep things aligned for DOS drivers
 #endif
@@ -143,6 +142,8 @@ extern	struct ticcmd_t	localcmds[LOCALCMDTICS];
 
 extern	int 			maketic;
 extern	int 			nettics[MAXNETNODES];
+extern	int				netdelay[MAXNETNODES][BACKUPTICS];
+extern	int 			nodeforplayer[MAXPLAYERS];
 
 extern	ticcmd_t		netcmds[MAXPLAYERS][BACKUPTICS];
 extern	int 			ticdup;
diff --git a/src/g_shared/shared_hud.cpp b/src/g_shared/shared_hud.cpp
index 2daeff7a8..110675791 100644
--- a/src/g_shared/shared_hud.cpp
+++ b/src/g_shared/shared_hud.cpp
@@ -37,6 +37,7 @@
 // copy would be.
 
 #include "doomtype.h"
+#include "doomdef.h"
 #include "v_video.h"
 #include "gi.h"
 #include "c_cvars.h"
@@ -48,6 +49,7 @@
 #include "p_local.h"
 #include "doomstat.h"
 #include "g_level.h"
+#include "d_net.h"
 
 #include <time.h>
 
@@ -73,6 +75,7 @@ CVAR (Bool,  hud_showscore,		false,	CVAR_ARCHIVE);	// for user maintained score
 CVAR (Bool,  hud_showweapons,	true, CVAR_ARCHIVE);	// Show weapons collected
 CVAR (Int ,  hud_showtime,		0,	    CVAR_ARCHIVE);	// Show time on HUD
 CVAR (Int ,  hud_timecolor,		CR_GOLD,CVAR_ARCHIVE);	// Color of in-game time on HUD
+CVAR (Int ,  hud_showlag,		0, CVAR_ARCHIVE);		// Show input latency (maketic - gametic difference)
 
 CVAR (Int, hud_ammo_red, 25, CVAR_ARCHIVE)					// ammo percent less than which status is red    
 CVAR (Int, hud_ammo_yellow, 50, CVAR_ARCHIVE)				// ammo percent less is yellow more green        
@@ -917,6 +920,51 @@ static void DrawTime()
 	DrawHudText(SmallFont, hud_timecolor, timeString, hudwidth - width, height, FRACUNIT);
 }
 
+//---------------------------------------------------------------------------
+//
+// Draw in-game latency
+//
+//---------------------------------------------------------------------------
+
+static void DrawLatency()
+{
+	if (hud_showlag <= 0 ||
+		(hud_showlag == 1 && !netgame) ||
+		hud_showlag > 2)
+	{
+		return;
+	}
+	int i, localdelay = 0, arbitratordelay = 0;
+	for (i = 0; i < BACKUPTICS; i++) localdelay += netdelay[0][i];
+	for (i = 0; i < BACKUPTICS; i++) arbitratordelay += netdelay[nodeforplayer[Net_Arbitrator]][i];
+	localdelay = ((localdelay / BACKUPTICS) * ticdup) * (1000 / TICRATE);
+	arbitratordelay = ((arbitratordelay / BACKUPTICS) * ticdup) * (1000 / TICRATE);
+	int color = CR_GREEN;
+	if (MAX(localdelay, arbitratordelay) > 200)
+	{
+		color = CR_YELLOW;
+	}
+	if (MAX(localdelay, arbitratordelay) > 400)
+	{
+		color = CR_ORANGE;
+	}
+	if (MAX(localdelay, arbitratordelay) >= ((BACKUPTICS / 2 - 1) * ticdup) * (1000 / TICRATE))
+	{
+		color = CR_RED;
+	}
+
+	char tempstr[32];
+
+	const int millis = (level.time % TICRATE) * (1000 / TICRATE);
+	mysnprintf(tempstr, sizeof(tempstr), "a:%dms - l:%dms", arbitratordelay, localdelay);
+
+	const int characterCount = strlen(tempstr);
+	const int width = SmallFont->GetCharWidth('0') * characterCount + 2; // small offset from screen's border
+	const int height = SmallFont->GetHeight() * 2;
+
+	DrawHudText(SmallFont, color, tempstr, hudwidth - width, height, FRACUNIT);
+}
+
 
 //---------------------------------------------------------------------------
 //
@@ -982,6 +1030,7 @@ void DrawHUD()
 		if (idmypos) DrawCoordinates(CPlayer);
 
 		DrawTime();
+		DrawLatency();
 	}
 	else
 	{
diff --git a/src/hu_scores.cpp b/src/hu_scores.cpp
index af5d1bbaa..8b9a7d0ad 100644
--- a/src/hu_scores.cpp
+++ b/src/hu_scores.cpp
@@ -48,6 +48,7 @@
 #include "d_player.h"
 #include "hu_stuff.h"
 #include "gstrings.h"
+#include "d_net.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -61,7 +62,7 @@
 
 static void HU_DoDrawScores (player_t *, player_t *[MAXPLAYERS]);
 static void HU_DrawTimeRemaining (int y);
-static void HU_DrawPlayer (player_t *, bool, int, int, int, int, int, int, int, int);
+static void HU_DrawPlayer(player_t *, bool, int, int, int, int, int, int, int, int, int);
 
 // EXTERNAL DATA DECLARATIONS ----------------------------------------------
 
@@ -228,7 +229,7 @@ static void HU_DoDrawScores (player_t *player, player_t *sortedplayers[MAXPLAYER
 	int maxnamewidth, maxscorewidth, maxiconheight;
 	int numTeams = 0;
 	int x, y, ypadding, bottom;
-	int col2, col3, col4;
+	int col2, col3, col4, col5;
 	
 	if (deathmatch)
 	{
@@ -309,12 +310,14 @@ static void HU_DoDrawScores (player_t *player, player_t *sortedplayers[MAXPLAYER
 
 	const char *text_color = GStrings("SCORE_COLOR"),
 		*text_frags = GStrings(deathmatch ? "SCORE_FRAGS" : "SCORE_KILLS"),
-		*text_name = GStrings("SCORE_NAME");
+		*text_name = GStrings("SCORE_NAME"),
+		*text_delay = GStrings("SCORE_DELAY");
 
 	col2 = (SmallFont->StringWidth(text_color) + 8) * CleanXfac;
 	col3 = col2 + (SmallFont->StringWidth(text_frags) + 8) * CleanXfac;
 	col4 = col3 + maxscorewidth * CleanXfac;
-	x = (SCREENWIDTH >> 1) - ((maxnamewidth * CleanXfac + col4) >> 1);
+	col5 = col4 + (maxnamewidth + 8) * CleanXfac;
+	x = (SCREENWIDTH >> 1) - (((SmallFont->StringWidth(text_delay) * CleanXfac) + col5) >> 1);
 
 	screen->DrawText (SmallFont, color, x, y, text_color,
 		DTA_CleanNoMove, true, TAG_DONE);
@@ -325,6 +328,9 @@ static void HU_DoDrawScores (player_t *player, player_t *sortedplayers[MAXPLAYER
 	screen->DrawText (SmallFont, color, x + col4, y, text_name,
 		DTA_CleanNoMove, true, TAG_DONE);
 
+	screen->DrawText(SmallFont, color, x + col5, y, text_delay,
+		DTA_CleanNoMove, true, TAG_DONE);
+
 	y += height + 6 * CleanYfac;
 	bottom -= height;
 
@@ -332,7 +338,7 @@ static void HU_DoDrawScores (player_t *player, player_t *sortedplayers[MAXPLAYER
 	{
 		if (playeringame[sortedplayers[i] - players])
 		{
-			HU_DrawPlayer (sortedplayers[i], player==sortedplayers[i], x, col2, col3, col4, maxnamewidth, y, ypadding, lineheight);
+			HU_DrawPlayer(sortedplayers[i], player == sortedplayers[i], x, col2, col3, col4, col5, maxnamewidth, y, ypadding, lineheight);
 			y += lineheight + CleanYfac;
 		}
 	}
@@ -377,7 +383,7 @@ static void HU_DrawTimeRemaining (int y)
 //
 //==========================================================================
 
-static void HU_DrawPlayer (player_t *player, bool highlight, int col1, int col2, int col3, int col4, int maxnamewidth, int y, int ypadding, int height)
+static void HU_DrawPlayer (player_t *player, bool highlight, int col1, int col2, int col3, int col4, int col5, int maxnamewidth, int y, int ypadding, int height)
 {
 	int color;
 	char str[80];
@@ -387,12 +393,13 @@ static void HU_DrawPlayer (player_t *player, bool highlight, int col1, int col2,
 		// The teamplay mode uses colors to show teams, so we need some
 		// other way to do highlighting. And it may as well be used for
 		// all modes for the sake of consistancy.
-		screen->Dim(MAKERGB(200,245,255), 0.125f, col1 - 12*CleanXfac, y - 1, col4 + (maxnamewidth + 24)*CleanXfac, height + 2);
+		screen->Dim(MAKERGB(200,245,255), 0.125f, col1 - 12*CleanXfac, y - 1, col5 + (maxnamewidth + 24)*CleanXfac, height + 2);
 	}
 
 	col2 += col1;
 	col3 += col1;
 	col4 += col1;
+	col5 += col1;
 
 	color = HU_GetRowColor(player, highlight);
 	HU_DrawColorBar(col1, y, height, (int)(player - players));
@@ -412,6 +419,18 @@ static void HU_DrawPlayer (player_t *player, bool highlight, int col1, int col2,
 	screen->DrawText (SmallFont, color, col4, y + ypadding, player->userinfo.GetName(),
 		DTA_CleanNoMove, true, TAG_DONE);
 
+	int avgdelay = 0;
+	for (int i = 0; i < BACKUPTICS; i++)
+	{
+		avgdelay += netdelay[nodeforplayer[(int)(player - players)]][i];
+	}
+	avgdelay /= BACKUPTICS;
+
+	mysnprintf(str, countof(str), "%d", (avgdelay * ticdup) * (1000 / TICRATE));
+
+	screen->DrawText(SmallFont, color, col5, y + ypadding, str,
+		DTA_CleanNoMove, true, TAG_DONE);
+
 	if (teamplay && Teams[player->userinfo.GetTeam()].GetLogo().IsNotEmpty ())
 	{
 		FTexture *pic = TexMan[Teams[player->userinfo.GetTeam()].GetLogo().GetChars ()];
diff --git a/src/i_net.cpp b/src/i_net.cpp
index 889688b48..3ec9d7881 100644
--- a/src/i_net.cpp
+++ b/src/i_net.cpp
@@ -208,11 +208,11 @@ void PacketSend (void)
 	{
 		I_FatalError("Netbuffer overflow!");
 	}
+	assert(!(doomcom.data[0] & NCMD_COMPRESSED));
 
 	uLong size = TRANSMIT_SIZE - 1;
 	if (doomcom.datalength >= 10)
 	{
-		assert(!(doomcom.data[0] & NCMD_COMPRESSED));
 		TransmitBuffer[0] = doomcom.data[0] | NCMD_COMPRESSED;
 		c = compress2(TransmitBuffer + 1, &size, doomcom.data + 1, doomcom.datalength - 1, 9);
 		size += 1;
@@ -938,11 +938,6 @@ bool I_InitNetwork (void)
 		doomcom.ticdup = 1;
 	}
 
-	if (Args->CheckParm ("-extratic"))
-		doomcom.extratics = 1;
-	else
-		doomcom.extratics = 0;
-
 	v = Args->CheckValue ("-port");
 	if (v)
 	{
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 2274e7571..f0087e220 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -380,7 +380,9 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 		// ... and some items can never be telefragged while others will be telefragged by everything that teleports upon them.
 		if ((StompAlwaysFrags && !(th->flags6 & MF6_NOTELEFRAG)) || (th->flags7 & MF7_ALWAYSTELEFRAG))
 		{
-			P_DamageMobj(th, thing, thing, TELEFRAG_DAMAGE, NAME_Telefrag, DMG_THRUSTLESS);
+			// Don't actually damage if predicting a teleport
+			if (thing->player == NULL || !(thing->player->cheats & CF_PREDICTING))
+				P_DamageMobj(th, thing, thing, TELEFRAG_DAMAGE, NAME_Telefrag, DMG_THRUSTLESS);
 			continue;
 		}
 		return false;
@@ -1981,13 +1983,6 @@ bool P_TryMove(AActor *thing, fixed_t x, fixed_t y,
 		thing->AdjustFloorClip();
 	}
 
-	// [RH] Don't activate anything if just predicting
-	if (thing->player && (thing->player->cheats & CF_PREDICTING))
-	{
-		thing->flags6 &= ~MF6_INTRYMOVE;
-		return true;
-	}
-
 	// if any special lines were hit, do the effect
 	if (!(thing->flags & (MF_TELEPORT | MF_NOCLIP)))
 	{
@@ -1998,7 +1993,11 @@ bool P_TryMove(AActor *thing, fixed_t x, fixed_t y,
 			oldside = P_PointOnLineSide(oldx, oldy, ld);
 			if (side != oldside && ld->special && !(thing->flags6 & MF6_NOTRIGGER))
 			{
-				if (thing->player)
+				if (thing->player && (thing->player->cheats & CF_PREDICTING))
+				{
+					P_PredictLine(ld, thing, oldside, SPAC_Cross);
+				}
+				else if (thing->player)
 				{
 					P_ActivateLine(ld, thing, oldside, SPAC_Cross);
 				}
@@ -2024,6 +2023,13 @@ bool P_TryMove(AActor *thing, fixed_t x, fixed_t y,
 		}
 	}
 
+	// [RH] Don't activate anything if just predicting
+	if (thing->player && (thing->player->cheats & CF_PREDICTING))
+	{
+		thing->flags6 &= ~MF6_INTRYMOVE;
+		return true;
+	}
+
 	// [RH] Check for crossing fake floor/ceiling
 	newsec = thing->Sector;
 	if (newsec->heightsec && oldsec->heightsec && newsec->SecActTarget)
diff --git a/src/p_spec.cpp b/src/p_spec.cpp
index 00ed322c0..d58062a7e 100644
--- a/src/p_spec.cpp
+++ b/src/p_spec.cpp
@@ -73,6 +73,7 @@
 static FRandom pr_playerinspecialsector ("PlayerInSpecialSector");
 void P_SetupPortals();
 
+EXTERN_CVAR(Bool, cl_predict_specials)
 
 IMPLEMENT_POINTY_CLASS (DScroller)
  DECLARE_POINTER (m_Interpolations[0])
@@ -408,6 +409,48 @@ bool P_TestActivateLine (line_t *line, AActor *mo, int side, int activationType)
 	return true;
 }
 
+//============================================================================
+//
+// P_PredictLine
+//
+//============================================================================
+
+bool P_PredictLine(line_t *line, AActor *mo, int side, int activationType)
+{
+	int lineActivation;
+	INTBOOL buttonSuccess;
+	BYTE special;
+
+	// Only predict a very specifc section of specials
+	if (line->special != Teleport_Line &&
+		line->special != Teleport)
+	{
+		return false;
+	}
+
+	if (!P_TestActivateLine(line, mo, side, activationType) || !cl_predict_specials)
+	{
+		return false;
+	}
+
+	if (line->locknumber > 0) return false;
+	lineActivation = line->activation;
+	buttonSuccess = false;
+	buttonSuccess = P_ExecuteSpecial(line->special,
+		line, mo, side == 1, line->args[0],
+		line->args[1], line->args[2],
+		line->args[3], line->args[4]);
+
+	special = line->special;
+
+	// end of changed code
+	if (developer && buttonSuccess)
+	{
+		Printf("Line special %d predicted on line %i\n", special, int(line - lines));
+	}
+	return true;
+}
+
 //
 // P_PlayerInSpecialSector
 // Called every tic frame
diff --git a/src/p_spec.h b/src/p_spec.h
index c9bb6eded..906a38a8c 100644
--- a/src/p_spec.h
+++ b/src/p_spec.h
@@ -166,6 +166,7 @@ void	P_UpdateSpecials (void);
 // when needed
 bool	P_ActivateLine (line_t *ld, AActor *mo, int side, int activationType);
 bool	P_TestActivateLine (line_t *ld, AActor *mo, int side, int activationType);
+bool	P_PredictLine (line_t *ld, AActor *mo, int side, int activationType);
 
 void 	P_PlayerInSpecialSector (player_t *player, sector_t * sector=NULL);
 void	P_PlayerOnSpecialFlat (player_t *player, int floorType);
diff --git a/src/p_teleport.cpp b/src/p_teleport.cpp
index 50470d9eb..b64c04a5a 100644
--- a/src/p_teleport.cpp
+++ b/src/p_teleport.cpp
@@ -96,6 +96,8 @@ void P_SpawnTeleportFog(fixed_t x, fixed_t y, fixed_t z, int spawnid)
 bool P_Teleport (AActor *thing, fixed_t x, fixed_t y, fixed_t z, angle_t angle,
 				 bool useFog, bool sourceFog, bool keepOrientation, bool bHaltVelocity, bool keepHeight)
 {
+	bool predicting = (thing->player && (thing->player->cheats & CF_PREDICTING));
+
 	fixed_t oldx;
 	fixed_t oldy;
 	fixed_t oldz;
@@ -181,7 +183,7 @@ bool P_Teleport (AActor *thing, fixed_t x, fixed_t y, fixed_t z, angle_t angle,
 		angle = thing->angle;
 	}
 	// Spawn teleport fog at source and destination
-	if (sourceFog)
+	if (sourceFog && !predicting)
 	{
 		fixed_t fogDelta = thing->flags & MF_MISSILE ? 0 : TELEFOGHEIGHT;
 		AActor *fog = Spawn<ATeleportFog> (oldx, oldy, oldz + fogDelta, ALLOW_REPLACE);
@@ -189,11 +191,14 @@ bool P_Teleport (AActor *thing, fixed_t x, fixed_t y, fixed_t z, angle_t angle,
 	}
 	if (useFog)
 	{
-		fixed_t fogDelta = thing->flags & MF_MISSILE ? 0 : TELEFOGHEIGHT;
-		an = angle >> ANGLETOFINESHIFT;
-		AActor *fog = Spawn<ATeleportFog> (x + 20*finecosine[an],
-			y + 20*finesine[an], thing->z + fogDelta, ALLOW_REPLACE);
-		fog->target = thing;
+		if (!predicting)
+		{
+			fixed_t fogDelta = thing->flags & MF_MISSILE ? 0 : TELEFOGHEIGHT;
+			an = angle >> ANGLETOFINESHIFT;
+			AActor *fog = Spawn<ATeleportFog>(x + 20 * finecosine[an],
+				y + 20 * finesine[an], thing->z + fogDelta, ALLOW_REPLACE);
+			fog->target = thing;
+		}
 		if (thing->player)
 		{
 			// [RH] Zoom player's field of vision
@@ -226,7 +231,7 @@ bool P_Teleport (AActor *thing, fixed_t x, fixed_t y, fixed_t z, angle_t angle,
 	return true;
 }
 
-static AActor *SelectTeleDest (int tid, int tag)
+static AActor *SelectTeleDest (int tid, int tag, bool norandom)
 {
 	AActor *searcher;
 
@@ -276,7 +281,7 @@ static AActor *SelectTeleDest (int tid, int tag)
 		}
 		else
 		{
-			if (count != 1)
+			if (count != 1 && !norandom)
 			{
 				count = 1 + (pr_teleport() % count);
 			}
@@ -323,6 +328,8 @@ static AActor *SelectTeleDest (int tid, int tag)
 bool EV_Teleport (int tid, int tag, line_t *line, int side, AActor *thing, bool fog,
 				  bool sourceFog, bool keepOrientation, bool haltVelocity, bool keepHeight)
 {
+	bool predicting = (thing->player && (thing->player->cheats & CF_PREDICTING));
+
 	AActor *searcher;
 	fixed_t z;
 	angle_t angle = 0;
@@ -342,7 +349,7 @@ bool EV_Teleport (int tid, int tag, line_t *line, int side, AActor *thing, bool
 	{ // Don't teleport if hit back of line, so you can get out of teleporter.
 		return 0;
 	}
-	searcher = SelectTeleDest (tid, tag);
+	searcher = SelectTeleDest(tid, tag, predicting);
 	if (searcher == NULL)
 	{
 		return false;
@@ -390,7 +397,7 @@ bool EV_Teleport (int tid, int tag, line_t *line, int side, AActor *thing, bool
 			thing->velx = FixedMul(velx, c) - FixedMul(vely, s);
 			thing->vely = FixedMul(vely, c) + FixedMul(velx, s);
 		}
-		if ((velx | vely) == 0 && thing->player != NULL && thing->player->mo == thing)
+		if ((velx | vely) == 0 && thing->player != NULL && thing->player->mo == thing && !predicting)
 		{
 			thing->player->mo->PlayIdle ();
 		}
diff --git a/src/p_user.cpp b/src/p_user.cpp
index fbe24cc83..7b049a2df 100644
--- a/src/p_user.cpp
+++ b/src/p_user.cpp
@@ -62,6 +62,7 @@ static FRandom pr_skullpop ("SkullPop");
 
 // Variables for prediction
 CVAR (Bool, cl_noprediction, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
+CVAR(Bool, cl_predict_specials, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 static player_t PredictionPlayerBackup;
 static BYTE PredictionActorBackup[sizeof(AActor)];
 static TArray<sector_t *> PredictionTouchingSectorsBackup;
@@ -2722,8 +2723,12 @@ void P_PredictPlayer (player_t *player)
 	}
 	act->BlockNode = NULL;
 
+	bool NoInterpolateOld = R_GetViewInterpolationStatus();
 	for (int i = gametic; i < maxtic; ++i)
 	{
+		if (!NoInterpolateOld)
+			R_RebuildViewInterpolation(player);
+
 		player->cmd = localcmds[i % LOCALCMDTICS];
 		P_PlayerThink (player);
 		player->mo->Tick ();
diff --git a/src/r_utility.cpp b/src/r_utility.cpp
index 5bf38ad26..19d446b5b 100644
--- a/src/r_utility.cpp
+++ b/src/r_utility.cpp
@@ -729,6 +729,46 @@ void R_ClearPastViewer (AActor *actor)
 	}
 }
 
+//==========================================================================
+//
+// R_RebuildViewInterpolation
+//
+//==========================================================================
+
+void R_RebuildViewInterpolation(player_t *player)
+{
+	InterpolationViewer *iview;
+	if (NoInterpolateView)
+	{
+		if (player != NULL && player->camera != NULL)
+		{
+			iview = FindPastViewer(player->camera);
+		}
+
+		if (iview == NULL)
+			return;
+
+		NoInterpolateView = false;
+		iview->oviewx = iview->nviewx;
+		iview->oviewy = iview->nviewy;
+		iview->oviewz = iview->nviewz;
+		iview->oviewpitch = iview->nviewpitch;
+		iview->oviewangle = iview->nviewangle;
+	}
+}
+
+//==========================================================================
+//
+// R_GetViewInterpolationStatus
+//
+//==========================================================================
+
+bool R_GetViewInterpolationStatus()
+{
+	return NoInterpolateView;
+}
+
+
 //==========================================================================
 //
 // R_SetupFrame
diff --git a/src/r_utility.h b/src/r_utility.h
index 85ca7c410..2d9aac086 100644
--- a/src/r_utility.h
+++ b/src/r_utility.h
@@ -61,6 +61,8 @@ inline angle_t R_PointToAngle (fixed_t x, fixed_t y) { return R_PointToAngle2 (v
 subsector_t *R_PointInSubsector (fixed_t x, fixed_t y);
 fixed_t R_PointToDist2 (fixed_t dx, fixed_t dy);
 void R_ResetViewInterpolation ();
+void R_RebuildViewInterpolation(player_t *player);
+bool R_GetViewInterpolationStatus();
 void R_SetViewSize (int blocks);
 void R_SetFOV (float fov);
 float R_GetFOV ();
diff --git a/src/version.h b/src/version.h
index c8917212d..92b1816a1 100644
--- a/src/version.h
+++ b/src/version.h
@@ -51,7 +51,7 @@ const char *GetVersionString();
 // Version identifier for network games.
 // Bump it every time you do a release unless you're certain you
 // didn't change anything that will affect sync.
-#define NETGAMEVERSION 230
+#define NETGAMEVERSION 231
 
 // Version stored in the ini's [LastRun] section.
 // Bump it if you made some configuration change that you want to
diff --git a/wadsrc/static/language.enu b/wadsrc/static/language.enu
index 4990cb417..a92e22dfe 100644
--- a/wadsrc/static/language.enu
+++ b/wadsrc/static/language.enu
@@ -836,6 +836,7 @@ SCORE_BONUS = "BONUS";
 SCORE_COLOR = "COLOR";
 SCORE_SECRET = "SECRET";
 SCORE_NAME = "NAME";
+SCORE_DELAY = "DELAY(ms)";
 SCORE_KILLS = "KILLS";
 SCORE_FRAGS = "FRAGS";
 SCORE_DEATHS = "DEATHS";
diff --git a/wadsrc/static/menudef.txt b/wadsrc/static/menudef.txt
index 324c94e6b..6d313faf1 100644
--- a/wadsrc/static/menudef.txt
+++ b/wadsrc/static/menudef.txt
@@ -341,6 +341,7 @@ OptionMenu "OptionsMenu"
 	Submenu "Automap Options",			"AutomapOptions"
 	Submenu "HUD Options",				"HUDOptions"
 	Submenu "Miscellaneous Options",	"MiscOptions"
+	Submenu "Network Options",			"NetworkOptions"
 	Submenu "Sound Options",			"SoundOptions"
 	Submenu "Display Options",			"VideoOptions"
 	Submenu "Set video mode",			"VideoModeMenu"
@@ -805,6 +806,13 @@ OptionValue "AltHUDTime"
 	9, "System"
 }
 
+OptionValue "AltHUDLag"
+{
+	0, "Off"
+	1, "Netgames only"
+	2, "Always"
+}
+
 OptionMenu "AltHUDOptions"
 {
 	Title "Alternative HUD"
@@ -819,6 +827,7 @@ OptionMenu "AltHUDOptions"
 	Option "Show weapons",							"hud_showweapons", "OnOff"
 	Option "Show time",								"hud_showtime", "AltHUDTime"
 	Option "Time color",							"hud_timecolor", "TextColors"
+	Option "Show network latency",					"hud_showlag", "AltHUDLag"
 	Slider "Red ammo display below %",				"hud_ammo_red", 0, 100, 1, 0
 	Slider "Yellow ammo display below %",			"hud_ammo_yellow", 0, 100, 1, 0
 	Slider "Red health display below",				"hud_health_red", 0, 100, 1, 0
@@ -1591,3 +1600,28 @@ OptionMenu VideoModeMenu
 	class VideoModeMenu
 }
 
+/*=======================================
+ *
+ * Network options menu
+ *
+ *=======================================*/
+
+OptionMenu NetworkOptions
+{
+	Title "NETWORK OPTIONS"
+	StaticText "Local options", 1
+	Option "Movement prediction",		"cl_noprediction", "OffOn"
+	Option "Predict line actions",		"cl_predict_specials", "OnOff"
+	StaticText " "
+	StaticText "Host options", 1
+	Option "Extra Tics",				"net_extratic", "ExtraTicMode"
+	Option "Latency balancing",			"net_ticbalance", "OnOff"
+	
+}
+
+OptionValue ExtraTicMode
+{
+	0, "None"
+	1, "1"
+	2, "All unacknowledged"
+}