diff --git a/maps/mountain_fortress_v3/functions.lua b/maps/mountain_fortress_v3/functions.lua
index c6af54314..0e2e5e8f7 100644
--- a/maps/mountain_fortress_v3/functions.lua
+++ b/maps/mountain_fortress_v3/functions.lua
@@ -866,7 +866,11 @@ local function on_wave_created(event)
     local wave_number = event.wave_number
 
     if wave_number % 50 == 0 then
-        WD.set_pause_wave_in_ticks(random(18000, 54000))
+        if wave_number >= 1500 then
+            WD.set_pause_wave_in_ticks(random(36000, 54000))
+        else
+            WD.set_pause_wave_in_ticks(random(18000, 54000))
+        end
     end
 end
 
diff --git a/maps/mountain_fortress_v3/stateful/table.lua b/maps/mountain_fortress_v3/stateful/table.lua
index 1f92ea666..4b2a63418 100644
--- a/maps/mountain_fortress_v3/stateful/table.lua
+++ b/maps/mountain_fortress_v3/stateful/table.lua
@@ -952,12 +952,12 @@ function Public.increase_enemy_damage_and_health()
     this.enemies_boosted = true
 
     if this.rounds_survived == 1 then
-        Event.raise(WD.events.on_biters_evolved, {force = game.forces.enemy})
+        Event.raise(WD.events.on_biters_evolved, {force = game.forces.enemy, health_increase = true})
         Event.raise(WD.events.on_biters_evolved, {force = game.forces.aggressors})
         Event.raise(WD.events.on_biters_evolved, {force = game.forces.aggressors_frenzy})
     else
         for _ = 1, this.rounds_survived do
-            Event.raise(WD.events.on_biters_evolved, {force = game.forces.enemy})
+            Event.raise(WD.events.on_biters_evolved, {force = game.forces.enemy, health_increase = true})
             Event.raise(WD.events.on_biters_evolved, {force = game.forces.aggressors})
             Event.raise(WD.events.on_biters_evolved, {force = game.forces.aggressors_frenzy})
         end
diff --git a/modules/wave_defense/main.lua b/modules/wave_defense/main.lua
index df57c9a1e..8a107c5ea 100644
--- a/modules/wave_defense/main.lua
+++ b/modules/wave_defense/main.lua
@@ -655,12 +655,20 @@ local function increase_biter_damage(force)
     local bio = new - 0.02
     local e_old_melee = e.get_ammo_damage_modifier('melee')
     local e_old_biological = e.get_ammo_damage_modifier('biological')
+    local e_old_speed_melee = e.get_gun_speed_modifier('melee')
+    local e_old_speed_biological = e.get_gun_speed_modifier('biological')
 
-    Public.debug_print('Melee: ' .. melee + e_old_melee)
-    Public.debug_print('Biological: ' .. bio + e_old_biological)
+    Public.debug_print('Melee damage: ' .. melee + e_old_melee)
+    Public.debug_print('Biological damage: ' .. bio + e_old_biological)
+
+    Public.debug_print('Melee speed: ' .. melee + e_old_speed_melee)
+    Public.debug_print('Biological speed: ' .. bio + e_old_speed_biological)
 
     e.set_ammo_damage_modifier('melee', melee + e_old_melee)
     e.set_ammo_damage_modifier('biological', bio + e_old_biological)
+
+    e.set_gun_speed_modifier('melee', melee + e_old_speed_melee)
+    e.set_gun_speed_modifier('biological', bio + e_old_speed_biological)
 end
 
 local function increase_biters_health()
@@ -1410,7 +1418,10 @@ Event.add(
         end
 
         increase_biter_damage(event.force)
-        increase_biters_health()
+
+        if event.health_increase then
+            increase_biters_health()
+        end
     end
 )