diff --git a/Core/Config.cpp b/Core/Config.cpp
index 83bf9602b..1c37fef2e 100644
--- a/Core/Config.cpp
+++ b/Core/Config.cpp
@@ -85,6 +85,7 @@ void Config::Load(const char *iniFileName)
 #endif
 	//FastMemory Default set back to True when solve UNIMPL _sceAtracGetContextAddress making game crash
 	cpu->Get("FastMemory", &bFastMemory, false);
+	cpu->Get("CPUSpeed", &iLockedCPUSpeed, false);
 
 	IniFile::Section *graphics = iniFile.GetOrCreateSection("Graphics");
 	graphics->Get("ShowFPSCounter", &iShowFPSCounter, false);
@@ -204,6 +205,7 @@ void Config::Save()
 		IniFile::Section *cpu = iniFile.GetOrCreateSection("CPU");
 		cpu->Set("Jit", bJit);
 		cpu->Set("FastMemory", bFastMemory);
+		cpu->Set("CPUSpeed", iLockedCPUSpeed);
 
 		IniFile::Section *graphics = iniFile.GetOrCreateSection("Graphics");
 		graphics->Set("ShowFPSCounter", iShowFPSCounter);
diff --git a/Core/Config.h b/Core/Config.h
index 2622fbad1..ff99aced4 100644
--- a/Core/Config.h
+++ b/Core/Config.h
@@ -52,6 +52,7 @@ public:
 	bool bIgnoreBadMemAccess;
 	bool bFastMemory;
 	bool bJit;
+	int iLockedCPUSpeed;
 	bool bAutoSaveSymbolMap;
 	std::string sReportHost;
 	std::vector<std::string> recentIsos;
diff --git a/Core/HLE/scePower.cpp b/Core/HLE/scePower.cpp
index 0903e3d07..1493f85c6 100644
--- a/Core/HLE/scePower.cpp
+++ b/Core/HLE/scePower.cpp
@@ -22,6 +22,7 @@
 
 #include "scePower.h"
 #include "sceKernelThread.h"
+#include "Core/Config.h"
 
 const int PSP_POWER_ERROR_TAKEN_SLOT = 0x80000020;
 const int PSP_POWER_ERROR_SLOTS_FULL = 0x80000022;
@@ -52,6 +53,12 @@ static int busFreq = 111;
 void __PowerInit() {
 	memset(powerCbSlots, 0, sizeof(powerCbSlots));
 	volatileMemLocked = false;
+
+	if(g_Config.iLockedCPUSpeed > 0) {
+		CoreTiming::SetClockFrequencyMHz(g_Config.iLockedCPUSpeed);
+		pllFreq = g_Config.iLockedCPUSpeed;
+		busFreq = g_Config.iLockedCPUSpeed / 2;
+	}
 }
 
 void __PowerDoState(PointerWrap &p) {
@@ -226,22 +233,37 @@ int sceKernelVolatileMemLock(int type, int paddr, int psize) {
 
 
 u32 scePowerSetClockFrequency(u32 pllfreq, u32 cpufreq, u32 busfreq) {
-	CoreTiming::SetClockFrequencyMHz(cpufreq);
-	pllFreq = pllfreq;
-	busFreq = busfreq;
-	INFO_LOG(HLE,"scePowerSetClockFrequency(%i,%i,%i)", pllfreq, cpufreq, busfreq);
+	if(g_Config.iLockedCPUSpeed > 0) {
+		INFO_LOG(HLE,"scePowerSetClockFrequency(%i,%i,%i): locked by user config at %i, %i, %i", pllfreq, cpufreq, busfreq, g_Config.iLockedCPUSpeed, g_Config.iLockedCPUSpeed, busFreq);
+	}
+	else {
+		CoreTiming::SetClockFrequencyMHz(cpufreq);
+		pllFreq = pllfreq;
+		busFreq = busfreq;
+		INFO_LOG(HLE,"scePowerSetClockFrequency(%i,%i,%i)", pllfreq, cpufreq, busfreq);
+	}
 	return 0;
 }
 
 u32 scePowerSetCpuClockFrequency(u32 cpufreq) {
-	CoreTiming::SetClockFrequencyMHz(cpufreq);
-	DEBUG_LOG(HLE,"scePowerSetCpuClockFrequency(%i)", cpufreq);
+	if(g_Config.iLockedCPUSpeed > 0) {
+		DEBUG_LOG(HLE,"scePowerSetCpuClockFrequency(%i): locked by user config at %i", cpufreq, g_Config.iLockedCPUSpeed);
+	}
+	else {
+		CoreTiming::SetClockFrequencyMHz(cpufreq);
+		DEBUG_LOG(HLE,"scePowerSetCpuClockFrequency(%i)", cpufreq);
+	}
 	return 0;
 }
 
 u32 scePowerSetBusClockFrequency(u32 busfreq) {
-	busFreq = busfreq;
-	DEBUG_LOG(HLE,"scePowerSetBusClockFrequency(%i)", busfreq);
+	if(g_Config.iLockedCPUSpeed > 0) {
+		DEBUG_LOG(HLE,"scePowerSetBusClockFrequency(%i): locked by user config at %i", busfreq, busFreq);
+	}
+	else {
+		busFreq = busfreq;
+		DEBUG_LOG(HLE,"scePowerSetBusClockFrequency(%i)", busfreq);
+	}
 	return 0;
 }
 
diff --git a/UI/MenuScreens.cpp b/UI/MenuScreens.cpp
index b2f137d8e..5cdb7fd55 100644
--- a/UI/MenuScreens.cpp
+++ b/UI/MenuScreens.cpp
@@ -1189,6 +1189,18 @@ void SystemScreen::render() {
 	if (g_Config.bJit)
 		UICheckBox(GEN_ID, x, y += stride, s->T("Fast Memory", "Fast Memory (unstable)"), ALIGN_TOPLEFT, &g_Config.bFastMemory);
 
+	bool LockCPUSpeed = g_Config.iLockedCPUSpeed != 0;
+	UICheckBox(GEN_ID, x, y += stride, s->T("Lock PSP CPU Speed"), ALIGN_TOPLEFT, &LockCPUSpeed);
+	if(LockCPUSpeed) {
+		if(g_Config.iLockedCPUSpeed <= 0)
+			g_Config.iLockedCPUSpeed = 222;
+		char showCPUSpeed[256];
+		sprintf(showCPUSpeed, "%s %d", s->T("Locked CPU Speed: "), g_Config.iLockedCPUSpeed);
+		ui_draw2d.DrawText(UBUNTU24, showCPUSpeed, x + 60, (y += stride) - 5, 0xFFFFFFFF, ALIGN_LEFT);
+	}
+	else {
+		g_Config.iLockedCPUSpeed = 0;
+	}
 	//UICheckBox(GEN_ID, x, y += stride, s->T("Daylight Savings"), ALIGN_TOPLEFT, &g_Config.bDayLightSavings);
 
 	const char *buttonPreferenceTitle;