diff --git a/doomsday/apps/plugins/common/include/config.h b/doomsday/apps/plugins/common/include/config.h
index 1174a9746d..58b73355c9 100644
--- a/doomsday/apps/plugins/common/include/config.h
+++ b/doomsday/apps/plugins/common/include/config.h
@@ -53,6 +53,7 @@ typedef struct libcommon_config_s {
 
     // Gameplay:
     byte            switchSoundOrigin;
+    byte            defaultRuleFastMonsters;
 
     // Weapons:
     byte            weaponCycleSequential; // if true multiple next/prev weapon impulses can be chained to allow the user to "count-click-switch".
diff --git a/doomsday/apps/plugins/common/include/g_common.h b/doomsday/apps/plugins/common/include/g_common.h
index ee3f094863..466f01e83f 100644
--- a/doomsday/apps/plugins/common/include/g_common.h
+++ b/doomsday/apps/plugins/common/include/g_common.h
@@ -221,6 +221,7 @@ byte G_Ruleset_RandomClasses();
 #else
 byte G_Ruleset_RespawnMonsters();
 #endif
+void G_Ruleset_UpdateDefaults();
 
 /// @todo remove me
 void G_SetGameActionMapCompletedAndSetNextMap(void);
diff --git a/doomsday/apps/plugins/common/src/common.c b/doomsday/apps/plugins/common/src/common.c
index 8b0ad925af..f07d6fe372 100644
--- a/doomsday/apps/plugins/common/src/common.c
+++ b/doomsday/apps/plugins/common/src/common.c
@@ -36,6 +36,13 @@ int Common_GetInteger(int id)
     return 0;
 }
 
+#ifdef __JDOOM__
+void fastMonstersChanged()
+{
+    G_Ruleset_UpdateDefaults();
+}
+#endif
+
 void Common_Register()
 {
     // Movement
@@ -46,4 +53,7 @@ void Common_Register()
 
     // Gameplay
     C_VAR_BYTE ("sound-switch-origin",  &cfg.common.switchSoundOrigin,  0, 0, 1);
+#ifdef __JDOOM__
+    C_VAR_BYTE2("game-monsters-fast",   &cfg.common.defaultRuleFastMonsters, 0, 0, 1, fastMonstersChanged);
+#endif
 }
diff --git a/doomsday/apps/plugins/common/src/game/g_game.cpp b/doomsday/apps/plugins/common/src/game/g_game.cpp
index a0fd283745..eef5444aaa 100644
--- a/doomsday/apps/plugins/common/src/game/g_game.cpp
+++ b/doomsday/apps/plugins/common/src/game/g_game.cpp
@@ -1929,6 +1929,13 @@ byte G_Ruleset_RespawnMonsters()
 }
 #endif
 
+void G_Ruleset_UpdateDefaults()
+{
+#if !__JHEXEN__
+    defaultGameRules.fast = cfg.common.defaultRuleFastMonsters;
+#endif
+}
+
 /**
  * Lookup the debriefing Finale for the current episode and map (if any).
  */
diff --git a/doomsday/apps/plugins/common/src/hu_menu.cpp b/doomsday/apps/plugins/common/src/hu_menu.cpp
index a2edb0e34c..48ed29122f 100644
--- a/doomsday/apps/plugins/common/src/hu_menu.cpp
+++ b/doomsday/apps/plugins/common/src/hu_menu.cpp
@@ -1008,6 +1008,12 @@ void Hu_MenuInitGameplayOptionsPage()
             .setShortcut('j');
 #endif
 
+#if __JDOOM__
+    page->addWidget(new LabelWidget("Fast Monsters"));
+    page->addWidget(new CVarToggleWidget("game-monsters-fast"))
+            .setShortcut('f');
+#endif
+
 #if __JDOOM64__
     page->addWidget(new LabelWidget("Weapon Recoil"));
     page->addWidget(new CVarToggleWidget("player-weapon-recoil"));
diff --git a/doomsday/apps/plugins/doom/src/d_main.cpp b/doomsday/apps/plugins/doom/src/d_main.cpp
index 8d3f275eee..bd39e15ce4 100644
--- a/doomsday/apps/plugins/doom/src/d_main.cpp
+++ b/doomsday/apps/plugins/doom/src/d_main.cpp
@@ -421,6 +421,8 @@ void D_PostInit()
         ::cfg.common.netDeathmatch = 1;
     }
 
+    ::defaultGameRules.fast = cfg.common.defaultRuleFastMonsters;
+
     // Apply these rules.
     ::defaultGameRules.noMonsters      = cmdLine.check("-nomonsters")? true : false;
     ::defaultGameRules.respawnMonsters = cmdLine.check("-respawn")   ? true : false;