diff --git a/Source/Project64-core/N64System/N64Class.h b/Source/Project64-core/N64System/N64Class.h
index 46d8901bd..e14700966 100644
--- a/Source/Project64-core/N64System/N64Class.h
+++ b/Source/Project64-core/N64System/N64Class.h
@@ -67,8 +67,7 @@ public:
     void   StartEmulation(bool NewThread);
     void   EndEmulation();
     void   SyncToAudio();
-    void   IncreaseSpeed() { m_Limiter.IncreaseSpeed(); }
-    void   DecreaseSpeed() { m_Limiter.DecreaseSpeed(); }
+    void   AlterSpeed(const CSpeedLimiter::ESpeedChange SpeedChange) { m_Limiter.AlterSpeed(SpeedChange); }
     void   Reset(bool bInitReg, bool ClearMenory);
     void   GameReset();
     void   PluginReset();
diff --git a/Source/Project64-core/N64System/SpeedLimiterClass.cpp b/Source/Project64-core/N64System/SpeedLimiterClass.cpp
index 1b78cee4e..6e867eaeb 100644
--- a/Source/Project64-core/N64System/SpeedLimiterClass.cpp
+++ b/Source/Project64-core/N64System/SpeedLimiterClass.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
 *                                                                           *
-* Project64 - A Nintendo 64 emulator.                                      *
+* Project64 - A Nintendo 64 emulator.                                       *
 * http://www.pj64-emu.com/                                                  *
 * Copyright (C) 2012 Project64. All rights reserved.                        *
 *                                                                           *
@@ -8,14 +8,23 @@
 * GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html                        *
 *                                                                           *
 ****************************************************************************/
+
 #include "stdafx.h"
-#include "SpeedLimiterClass.h"
+#include "Project64-Core/N64System/SpeedLimiterClass.h"
+
 #include <Common/Util.h>
 
+// ---------------------------------------------------
+
+const uint32_t CSpeedLimiter::m_HighSpeed = 60;
+const uint32_t CSpeedLimiter::m_MediumSpeed = 15;
+
+// ---------------------------------------------------
+
 CSpeedLimiter::CSpeedLimiter() :
 m_Frames(0),
-m_Speed(60),
-m_BaseSpeed(60)
+m_Speed(m_HighSpeed),
+m_BaseSpeed(m_HighSpeed)
 {
 }
 
@@ -73,38 +82,24 @@ bool CSpeedLimiter::Timer_Process(uint32_t * FrameRate)
     return false;
 }
 
-void CSpeedLimiter::IncreaseSpeed()
+void CSpeedLimiter::AlterSpeed( const ESpeedChange SpeedChange )
 {
-    if (m_Speed >= 60)
-    {
-        m_Speed += 10;
-    }
-    else if (m_Speed >= 15)
-    {
-        m_Speed += 5;
-    }
-    else
-    {
-        m_Speed += 1;
-    }
-    SpeedChanged(m_Speed);
-    FixSpeedRatio();
-}
+	int32_t SpeedFactor = 1;
+	if (SpeedChange == DECREASE_SPEED) { SpeedFactor = -1; }
 
-void CSpeedLimiter::DecreaseSpeed()
-{
-    if (m_Speed > 60)
-    {
-        m_Speed -= 10;
-    }
-    else if (m_Speed > 15)
-    {
-        m_Speed -= 5;
-    }
-    else if (m_Speed > 1)
-    {
-        m_Speed -= 1;
-    }
-    SpeedChanged(m_Speed);
-    FixSpeedRatio();
-}
+	if (m_Speed >= m_HighSpeed)
+	{
+		m_Speed += 10 * SpeedFactor;
+	}
+	else if (m_Speed >= m_MediumSpeed)
+	{
+		m_Speed += 5 * SpeedFactor;
+	}
+	else
+	{
+		m_Speed += 1 * SpeedFactor;
+	}
+
+	SpeedChanged(m_Speed);
+	FixSpeedRatio();
+}
\ No newline at end of file
diff --git a/Source/Project64-core/N64System/SpeedLimiterClass.h b/Source/Project64-core/N64System/SpeedLimiterClass.h
index e213373ae..4e38b3034 100644
--- a/Source/Project64-core/N64System/SpeedLimiterClass.h
+++ b/Source/Project64-core/N64System/SpeedLimiterClass.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 *                                                                           *
-* Project64 - A Nintendo 64 emulator.                                      *
+* Project64 - A Nintendo 64 emulator.                                       *
 * http://www.pj64-emu.com/                                                  *
 * Copyright (C) 2012 Project64. All rights reserved.                        *
 *                                                                           *
@@ -11,19 +11,22 @@
 #pragma once
 
 #include <Project64-core/Settings/GameSettings.h>
+
 #include <Common/HighResTimeStamp.h>
 
 class CSpeedLimiter :
     private CGameSettings
 {
 public:
+	enum ESpeedChange { INCREASE_SPEED, DECREASE_SPEED };
+
     CSpeedLimiter();
     ~CSpeedLimiter();
 
     void SetHertz(const uint32_t Hertz);
     bool Timer_Process(uint32_t* const FrameRate);
-    void IncreaseSpeed();
-    void DecreaseSpeed();
+
+	void AlterSpeed(const ESpeedChange SpeedChange);
 
 private:
     CSpeedLimiter(const CSpeedLimiter&);            // Disable copy constructor
@@ -31,7 +34,10 @@ private:
 
     void FixSpeedRatio();
 
-    uint32_t m_Speed, m_BaseSpeed, m_Frames;
-    HighResTimeStamp m_LastTime;
-    uint32_t m_MicroSecondsPerFrame;
+	HighResTimeStamp m_LastTime;
+
+    uint32_t m_Speed, m_BaseSpeed, m_Frames, m_MicroSecondsPerFrame;
+
+	static const uint32_t m_HighSpeed;
+	static const uint32_t m_MediumSpeed;
 };
diff --git a/Source/Project64/UserInterface/MainMenuClass.cpp b/Source/Project64/UserInterface/MainMenuClass.cpp
index b29c518ea..8339b52a5 100644
--- a/Source/Project64/UserInterface/MainMenuClass.cpp
+++ b/Source/Project64/UserInterface/MainMenuClass.cpp
@@ -385,10 +385,10 @@ bool CMainMenu::ProcessMessage(HWND hWnd, DWORD /*FromAccelerator*/, DWORD MenuI
         }
         break;
     case ID_OPTIONS_INCREASE_SPEED:
-        g_BaseSystem->IncreaseSpeed();
+        g_BaseSystem->AlterSpeed(CSpeedLimiter::INCREASE_SPEED);
         break;
     case ID_OPTIONS_DECREASE_SPEED:
-        g_BaseSystem->DecreaseSpeed();
+        g_BaseSystem->AlterSpeed(CSpeedLimiter::DECREASE_SPEED);
         break;
     case ID_OPTIONS_FULLSCREEN:
         g_BaseSystem->ExternalEvent(SysEvent_ChangingFullScreen);