diff --git a/src/py65/tests/devices/test_mpu6502.py b/src/py65/tests/devices/test_mpu6502.py
index f067445..221b530 100644
--- a/src/py65/tests/devices/test_mpu6502.py
+++ b/src/py65/tests/devices/test_mpu6502.py
@@ -17,6 +17,30 @@ class Common6502Tests:
     self.assertEqual(0, mpu.y)
     self.assertEqual(mpu.BREAK | mpu.UNUSED, mpu.p)
 
+  # Benchmark
+  #     $0000  d8        CLD
+  #     $0001  18        CLC
+  #     $0002  a9 00     LDA #$00
+  #     $0004  a2 00     LDX #$00
+  #     $0006  a0 00     LDY #$00
+  #     $0008  c8        INY
+  #     $0009  d0 fd     BNE $0008
+  #     $000b  e8        INX
+  #     $000c  d0 f8     BNE $0006
+  #     $000e  69 01     ADC #$01
+  #     $0010  d0 f2     BNE $0004
+  #     $0012  00        BRK
+
+  def test_benchmark(self):
+    mpu = self._make_mpu()
+    self._write(mpu.memory, 0x0000, (0xd8, 0x18, 0xa9, 0x00, 0xa2, 0x00, 0xa0, 0x00, 0xc8, 0xd0, 0xfd, 0xe8, 0xd0, 0xf8, 0x69, 0x01, 0xd0, 0xf2, 0x00, 0xed))
+    for i in range(1,100):  # need a larger limit for this test to dominate the test time (but when benchmarking it doesn't need to pass)
+      mpu.step()
+    self.assertEqual(47, mpu.y)
+    self.assertEqual(0, mpu.x)
+    self.assertEqual(0, mpu.a)
+    self.assertEqual(0, mpu.p & mpu.ZERO)
+
   # ADC Absolute
   
   def test_adc_bcd_off_absolute_carry_clear_in_accumulator_zeroes(self):