diff --git a/Common/Math/math_util.cpp b/Common/Math/math_util.cpp
index 6e72791f87..9b1a59a755 100644
--- a/Common/Math/math_util.cpp
+++ b/Common/Math/math_util.cpp
@@ -1,5 +1,44 @@
 #include "Common/Math/math_util.h"
+#include <stdlib.h>
 
-#include <cstdlib>
+// QNX can only use RunFast mode and it is already the default.
+#if defined(__ARM_ARCH_7A__)
+// Enables 'RunFast' VFP mode.
+void EnableFZ() {
+	int x;
+	asm(
+		"fmrx %[result],FPSCR \r\n"
+		"orr %[result],%[result],#16777216 \r\n"
+		"fmxr FPSCR,%[result]"
+		:[result] "=r" (x) : :
+	);
+	//printf("ARM FPSCR: %08x\n",x);
+}
 
-// Could delete this file, but might find use again.
+// New fastmode code from: http://pandorawiki.org/Floating_Point_Optimization
+// These settings turbocharge the slow VFP unit on Cortex-A8 based chips by setting
+// restrictions that permit running VFP instructions on the NEON unit.
+// Denormal flush-to-zero, for example.
+void FPU_SetFastMode() {
+	static const unsigned int x = 0x04086060;
+	static const unsigned int y = 0x03000000;
+	int r;
+	asm volatile (
+		"fmrx	%0, fpscr			\n\t"	//r0 = FPSCR
+		"and	%0, %0, %1			\n\t"	//r0 = r0 & 0x04086060
+		"orr	%0, %0, %2			\n\t"	//r0 = r0 | 0x03000000
+		"fmxr	fpscr, %0			\n\t"	//FPSCR = r0
+		: "=r"(r)
+		: "r"(x), "r"(y)
+		);
+}
+
+#else
+
+void EnableFZ() {
+	// TODO
+}
+
+void FPU_SetFastMode() {}
+
+#endif
diff --git a/Common/Math/math_util.h b/Common/Math/math_util.h
index 8f8962cab4..fd47662b54 100644
--- a/Common/Math/math_util.h
+++ b/Common/Math/math_util.h
@@ -189,3 +189,12 @@ inline uint16_t ShrinkToHalf(float full) {
 	FP16 fp = float_to_half_fast3(fp32);
 	return fp.u;
 }
+
+// FPU control.
+void EnableFZ();
+
+// Enable both FZ and Default-NaN. Is documented to flip some ARM implementation into a "run-fast" mode
+// where they can schedule VFP instructions on the NEON unit (these implementations have
+// very slow VFP units).
+// http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0274h/Babffifj.html
+void FPU_SetFastMode();
diff --git a/Qt/QtMain.cpp b/Qt/QtMain.cpp
index c6381a112d..bba1f1ae2b 100644
--- a/Qt/QtMain.cpp
+++ b/Qt/QtMain.cpp
@@ -316,6 +316,7 @@ static int mainInternal(QApplication &a) {
 	emugl->resize(pixel_xres, pixel_yres);
 	emugl->showFullScreen();
 #endif
+	EnableFZ();
 	// Disable screensaver
 #if defined(QT_HAS_SYSTEMINFO)
 	QScreenSaver ssObject(emugl);
diff --git a/SDL/SDLMain.cpp b/SDL/SDLMain.cpp
index 0a6daa5361..da966cabae 100644
--- a/SDL/SDLMain.cpp
+++ b/SDL/SDLMain.cpp
@@ -807,6 +807,7 @@ int main(int argc, char *argv[]) {
 	} else {
 		joystick = nullptr;
 	}
+	EnableFZ();
 
 	int framecount = 0;
 	bool mouseDown = false;
diff --git a/ios/ViewController.mm b/ios/ViewController.mm
index 63d241cf46..c90c30a22a 100644
--- a/ios/ViewController.mm
+++ b/ios/ViewController.mm
@@ -807,3 +807,6 @@ void bindDefaultFBO()
 {
 	[sharedViewController bindDefaultFBO];
 }
+
+void EnableFZ(){};
+void DisableFZ(){};