Index: plugins/GSdx/GSPerfMon.cpp
===================================================================
--- plugins/GSdx/GSPerfMon.cpp	(revision 1598)
+++ plugins/GSdx/GSPerfMon.cpp	(working copy)
@@ -24,11 +24,11 @@
 
 GSPerfMon::GSPerfMon()
 	: m_total(0)
-	, m_begin(0)
 	, m_frame(0)
 	, m_lastframe(0)
 	, m_count(0)
 {
+	QueryPerformanceCounter(&m_begin);
 	memset(m_counters, 0, sizeof(m_counters));
 	memset(m_stats, 0, sizeof(m_stats));
 }
@@ -37,14 +37,6 @@
 {
 	if(c == Frame)
 	{
-		clock_t now = clock();
-		
-		if(m_lastframe != 0)
-		{
-			m_counters[c] += now - m_lastframe;
-		}
-
-		m_lastframe = now;
 		m_frame++;
 		m_count++;
 	}
@@ -71,29 +63,23 @@
 
 void GSPerfMon::Start()
 {
-	m_start = __rdtsc();
-
-	if(m_begin == 0)
-	{
-		m_begin = m_start;
-	}
+	QueryPerformanceCounter(&m_start);
 }
 
 void GSPerfMon::Stop()
 {
-	if(m_start > 0)
-	{
-		m_total += __rdtsc() - m_start;
-		m_start = 0;
-	}
+	LARGE_INTEGER now; QueryPerformanceCounter(&now);
+
+	m_total += now.QuadPart - m_start.QuadPart;
 }
 
 int GSPerfMon::CPU()
 {
-	int percent = (int)(100 * m_total / (__rdtsc() - m_begin));
+	LARGE_INTEGER now; QueryPerformanceCounter(&now);
 
-	m_begin = 0;
-	m_start = 0;
+	int percent = (int)(.5 + 100. * m_total / (now.QuadPart - m_begin.QuadPart));
+
+	QueryPerformanceCounter(&m_begin);
 	m_total = 0;
 
 	return percent;
Index: plugins/GSdx/GSPerfMon.h
===================================================================
--- plugins/GSdx/GSPerfMon.h	(revision 1598)
+++ plugins/GSdx/GSPerfMon.h	(working copy)
@@ -24,12 +24,13 @@
 class GSPerfMon
 {
 public:
-	enum counter_t {Frame, Prim, Draw, Swizzle, Unswizzle, Fillrate, Quad, CounterLast};
+	enum counter_t {Prim, Draw, Swizzle, Unswizzle, Fillrate, Quad, CounterLast, Frame};
 
 protected:
 	double m_counters[CounterLast];
 	double m_stats[CounterLast];
-	uint64 m_begin, m_total, m_start, m_frame;
+	uint64 m_frame, m_total;
+	LARGE_INTEGER m_begin, m_start;
 	clock_t m_lastframe;
 	int m_count;