diff --git a/desmume/src/GPU_osd.cpp b/desmume/src/GPU_osd.cpp
index 6e893fb74..5717b8ca1 100644
--- a/desmume/src/GPU_osd.cpp
+++ b/desmume/src/GPU_osd.cpp
@@ -528,7 +528,7 @@ void DrawHUD()
 
 	if (CommonSettings.hud.FpsDisplay) 
 	{
-		osd->addFixed(Hud.FpsDisplay.x, Hud.FpsDisplay.y, "Fps:%02d/%02d (%02d%%)%s", Hud.fps, Hud.fps3d, Hud.arm9load, driver->EMU_IsEmulationPaused() ? " (paused)" : "");
+		osd->addFixed(Hud.FpsDisplay.x, Hud.FpsDisplay.y, "Fps:%02d/%02d (%02d%%/%02d%%)%s", Hud.fps, Hud.fps3d, Hud.cpuload[0], Hud.cpuload[1], driver->EMU_IsEmulationPaused() ? " (paused)" : "");
 	}
 
 	if (CommonSettings.hud.FrameCounterDisplay) 
diff --git a/desmume/src/GPU_osd.h b/desmume/src/GPU_osd.h
index 999973bc0..5645c9b96 100644
--- a/desmume/src/GPU_osd.h
+++ b/desmume/src/GPU_osd.h
@@ -58,7 +58,7 @@ public:
 	{
 		fps = 0;
 		fps3d = 0;
-		arm9load = 0;
+		cpuload[0] = cpuload[1] = 0;
 		cpuloopIterationCount = 0;
 		clicked = false;
 	}
@@ -76,7 +76,7 @@ public:
 	HudCoordinates &hud(int i) { return ((HudCoordinates*)this)[i]; }
 	void reset();
 
-	int fps, fps3d, arm9load, cpuloopIterationCount;
+	int fps, fps3d, cpuload[2], cpuloopIterationCount;
 	bool clicked;
 };
 
diff --git a/desmume/src/NDSSystem.cpp b/desmume/src/NDSSystem.cpp
index 5959b9ba2..00df55b13 100644
--- a/desmume/src/NDSSystem.cpp
+++ b/desmume/src/NDSSystem.cpp
@@ -1522,10 +1522,12 @@ static void execHardware_hstart_vblankStart()
 	triggerDma(EDMAMode_VBlank);
 
 	//tracking for arm9 load average
-	nds.runCycleCollector[nds.idleFrameCounter] = 1120380-nds.idleCycles;
+	nds.runCycleCollector[0][nds.idleFrameCounter] = 1120380-nds.idleCycles[0];
+	nds.runCycleCollector[1][nds.idleFrameCounter] = 1120380-nds.idleCycles[1];
 	nds.idleFrameCounter++;
 	nds.idleFrameCounter &= 15;
-	nds.idleCycles = 0;
+	nds.idleCycles[0] = 0;
+	nds.idleCycles[1] = 0;
 }
 
 static void execHardware_hstart_vcount()
@@ -1866,7 +1868,7 @@ static /*donotinline*/ std::pair<s32,s32> armInnerLoop(
 			{
 				s32 temp = arm9;
 				arm9 = min(s32next, arm9 + kIrqWait);
-				nds.idleCycles += arm9-temp;
+				nds.idleCycles[0] += arm9-temp;
 				if (gxFIFO.size < 255) nds.freezeBus = FALSE;
 			}
 		}
@@ -1882,7 +1884,9 @@ static /*donotinline*/ std::pair<s32,s32> armInnerLoop(
 			}
 			else
 			{
+				s32 temp = arm7;
 				arm7 = min(s32next, arm7 + kIrqWait);
+				nds.idleCycles[1] += arm7-temp;
 				if(arm7 == s32next)
 				{
 					nds_timer = nds_timer_base + minarmtime<doarm9,false>(arm9,arm7);
@@ -2014,9 +2018,17 @@ void NDS_exec(s32 nb)
 #endif
 
 			//if we were waiting for an irq, don't wait too long:
-			//let's re-analyze it after this hardware event
-			if(NDS_ARM9.waitIRQ) nds_arm9_timer = nds_timer;
-			if(NDS_ARM7.waitIRQ) nds_arm7_timer = nds_timer;
+			//let's re-analyze it after this hardware event (this rolls back a big burst of irq waiting which may have been interrupted by a resynch)
+			if(NDS_ARM9.waitIRQ)
+			{
+				nds.idleCycles[0] -= (s32)(nds_arm9_timer-nds_timer);
+				nds_arm9_timer = nds_timer;
+			}
+			if(NDS_ARM7.waitIRQ)
+			{
+				nds.idleCycles[1] -= (s32)(nds_arm7_timer-nds_timer);
+				nds_arm7_timer = nds_timer;
+			}
 		}
 	}
 
diff --git a/desmume/src/NDSSystem.h b/desmume/src/NDSSystem.h
index 12b412581..2f334ab39 100644
--- a/desmume/src/NDSSystem.h
+++ b/desmume/src/NDSSystem.h
@@ -186,8 +186,8 @@ struct NDSSystem
 	//it was perhaps a mistake to put it here.
 	//it is far less important than the above.
 	//maybe I should move it.
-	s32 idleCycles;
-	s32 runCycleCollector[16];
+	s32 idleCycles[2];
+	s32 runCycleCollector[2][16];
 	s32 idleFrameCounter;
 	s32 cpuloopIterationCount; //counts the number of times during a frame that a reschedule happened
 
diff --git a/desmume/src/windows/main.cpp b/desmume/src/windows/main.cpp
index 6c5c4d172..9c62b1066 100644
--- a/desmume/src/windows/main.cpp
+++ b/desmume/src/windows/main.cpp
@@ -1829,11 +1829,27 @@ static void StepRunLoop_User()
 	if(nds.idleFrameCounter==0 || oneSecond) 
 	{
 		//calculate a 16 frame arm9 load average
-		int load = 0;
-		for(int i=0;i<16;i++)
-			load = load/8 + nds.runCycleCollector[(i+nds.idleFrameCounter)&15]*7/8;
-		load = std::min(100,std::max(0,(int)(load*100/1120380)));
-		Hud.arm9load = load;
+		for(int cpu=0;cpu<2;cpu++)
+		{
+			int load = 0;
+			//printf("%d: ",cpu);
+			for(int i=0;i<16;i++)
+			{
+				//blend together a few frames to keep low-framerate games from having a jittering load average
+				//(they will tend to work 100% for a frame and then sleep for a while)
+				//4 frames should handle even the slowest of games
+				s32 sample = 
+					nds.runCycleCollector[cpu][(i+0+nds.idleFrameCounter)&15]
+				+	nds.runCycleCollector[cpu][(i+1+nds.idleFrameCounter)&15]
+				+	nds.runCycleCollector[cpu][(i+2+nds.idleFrameCounter)&15]
+				+	nds.runCycleCollector[cpu][(i+3+nds.idleFrameCounter)&15];
+				sample /= 4;
+				load = load/8 + sample*7/8;
+			}
+			//printf("\n");
+			load = std::min(100,std::max(0,(int)(load*100/1120380)));
+			Hud.cpuload[cpu] = load;
+		}
 	}
 
 	Hud.cpuloopIterationCount = nds.cpuloopIterationCount;
@@ -3644,7 +3660,7 @@ void ScreenshotToClipboard(bool extraInfo)
 		memcpy(&str[titlelen+1], &MMU.CART_ROM[12], 6); str[titlelen+1+6] = '\0';
 		TextOut(hMemDC, 8, 384 + 14 * (twolinever ? 3:2), str, strlen(str));
 
-		sprintf(str, "FPS: %i/%i (%02d%%) | %s", mainLoopData.fps, mainLoopData.fps3d, Hud.arm9load, paused ? "Paused":"Running");
+		sprintf(str, "FPS: %i/%i (%02d%%/%02d%%) | %s", mainLoopData.fps, mainLoopData.fps3d, Hud.cpuload[0], Hud.cpuload[1], paused ? "Paused":"Running");
 		TextOut(hMemDC, 8, 384 + 14 * (twolinever ? 4:3), str, strlen(str));
 
 		sprintf(str, "3D Render: %s", core3DList[cur3DCore]->name);