diff --git a/NeoPixelBus.cpp b/NeoPixelBus.cpp
index ffc777f..1882b56 100644
--- a/NeoPixelBus.cpp
+++ b/NeoPixelBus.cpp
@@ -75,35 +75,113 @@ void NeoPixelBus::Begin(void)
 
 #if defined(ESP8266)
 
-void ICACHE_FLASH_ATTR send_ws_0_800(uint8_t gpio) {
-    uint8_t i;
-    i = 4; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, 1 << gpio);
-    i = 7; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, 1 << gpio);
+
+#define CYCLES_800_T0H  (F_CPU / 2500000 - 2) // 0.4us
+#define CYCLES_800_T1H  (F_CPU / 1250000 - 2) // 0.8us
+#define CYCLES_800      (F_CPU /  800000 - 2) // 1.25us per bit
+#define CYCLES_400_T0H  (F_CPU / 2000000 - 2)
+#define CYCLES_400_T1H  (F_CPU /  833333 - 2)
+#define CYCLES_400      (F_CPU /  400000 - 2) 
+
+#define RSR_CCOUNT(r)     __asm__ __volatile__("rsr %0,234":"=a" (r))
+
+static inline ICACHE_FLASH_ATTR uint32_t get_ccount(void)
+{
+    uint32_t ccount;
+    RSR_CCOUNT(ccount);
+    return ccount;
 }
 
-void ICACHE_FLASH_ATTR send_ws_1_800(uint8_t gpio) {
-    uint8_t i;
-    i = 9; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, 1 << gpio);
-    i = 2; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, 1 << gpio);
+
+static inline void ICACHE_FLASH_ATTR send_pixels_800(uint8_t* pixels, uint8_t* end, uint8_t pin)
+{
+    const uint32_t pinRegister = _BV(pin);
+    uint32_t mask;  // 32 bit work is optimized for the chip
+    uint32_t subpix;  // 32 bit work is optimized for the chip
+    uint32_t cyclesStart;
+
+    cyclesStart = get_ccount() + CYCLES_800;
+    while (pixels < end)
+    {
+        subpix = *pixels++;
+        for (mask = 0x80; mask; mask >>= 1)
+        {
+            uint32_t nextBit = (subpix & mask);
+            uint32_t cyclesNext = cyclesStart;
+
+            // after we have done as much work as needed for this next bit
+            // now wait for the HIGH
+            do
+            {
+                cyclesStart = get_ccount();
+            }
+            while ((cyclesStart - cyclesNext) < CYCLES_800);
+
+
+            GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
+
+            // wait for the LOW
+            if (nextBit)
+            {
+                while ((get_ccount() - cyclesStart) < CYCLES_800_T1H);
+            }
+            else
+            {
+                while ((get_ccount() - cyclesStart) < CYCLES_800_T0H);
+            }
+            
+            GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
+        }
+    }
+    while ((get_ccount() - cyclesStart) < CYCLES_800);
 }
 
-void ICACHE_FLASH_ATTR send_ws_0_400(uint8_t gpio) {
-    uint8_t i;
-    i = 8; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, 1 << gpio);
-    i = 12; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, 1 << gpio);
-}
+static inline void ICACHE_FLASH_ATTR send_pixels_400(uint8_t* pixels, uint8_t* end, uint8_t pin)
+{
+    const uint32_t pinRegister = _BV(pin);
+    uint32_t mask; // 32 bit work is optimized for the chip
+    uint32_t subpix; // 32 bit work is optimized for the chip
+    uint32_t cyclesStart;
 
-void ICACHE_FLASH_ATTR send_ws_1_400(uint8_t gpio) {
-    uint8_t i;
-    i = 18; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, 1 << gpio);
-    i = 4; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, 1 << gpio);
+    cyclesStart = get_ccount() + CYCLES_400;
+    while (pixels < end)
+    {
+        subpix = *pixels++;
+        for (mask = 0x80; mask; mask >>= 1)
+        {
+            uint32_t nextBit = (subpix & mask);
+            uint32_t cyclesNext = cyclesStart;
+
+            // after we have done as much work as needed for this next bit
+            // now wait for the HIGH
+            do
+            {
+                cyclesStart = get_ccount();
+            } while ((cyclesStart - cyclesNext) < CYCLES_400);
+
+
+            GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinRegister);
+
+            // wait for the LOW
+            if (nextBit)
+            {
+                while ((get_ccount() - cyclesStart) < CYCLES_400_T1H);
+            }
+            else
+            {
+                while ((get_ccount() - cyclesStart) < CYCLES_400_T0H);
+            }
+
+            GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinRegister);
+        }
+    }
+    while ((get_ccount() - cyclesStart) < CYCLES_400);
 }
 
 #endif
 
 
 #if defined(ESP8266)
-
 void ICACHE_FLASH_ATTR NeoPixelBus::Show(void)
 
 #else
@@ -749,41 +827,14 @@ void NeoPixelBus::Show(void)
     {
 #endif
         // 800 KHz bitstream
-        while (p < end)
-        {
-            uint8_t subpix = *p++;
-            for (uint8_t mask = 0x80; mask; mask >>= 1)
-            {
-                if (subpix & mask)
-                {
-                    send_ws_1_800(_pin);
-                }
-                else
-                {
-                    send_ws_0_800(_pin);
-                }
-            }
-        }
+        send_pixels_800(p, end, _pin);
+
 #ifdef INCLUDE_NEO_KHZ400_SUPPORT
     }
     else
     {
         // 400 kHz bitstream
-        while (p < end)
-        {
-            uint8_t subpix = *p++;
-            for (uint8_t mask = 0x80; mask; mask >>= 1)
-            {
-                if (subpix & mask)
-                {
-                    send_ws_1_400(_pin);
-                }
-                else
-                {
-                    send_ws_0_400(_pin);
-                }
-            }
-        }
+        send_pixels_400(p, end, _pin);
     }
 #endif 
 
@@ -794,7 +845,7 @@ void NeoPixelBus::Show(void)
 #if defined(__MK20DX128__) || defined(__MK20DX256__) // Teensy 3.0 & 3.1
 #define CYCLES_800_T0H  (F_CPU / 2500000) // 0.4us
 #define CYCLES_800_T1H  (F_CPU / 1250000) // 0.8us
-#define CYCLES_800      (F_CPU /  800000) // 12.5us per bit
+#define CYCLES_800      (F_CPU /  800000) // 1.25us per bit
 #define CYCLES_400_T0H  (F_CPU / 2000000)
 #define CYCLES_400_T1H  (F_CPU /  833333)
 #define CYCLES_400      (F_CPU /  400000) 
@@ -943,9 +994,7 @@ void NeoPixelBus::Show(void)
     ResetDirty();
     _endTime = micros(); // Save EOD time for latch on next call
 }
-#if defined(ESP8266)
-#pragma optimize( "", on )
-#endif
+
 
 // Set the output pin number
 void NeoPixelBus::setPin(uint8_t p) 
diff --git a/NeoPixelBus.h b/NeoPixelBus.h
index 8a75af5..cf61d13 100644
--- a/NeoPixelBus.h
+++ b/NeoPixelBus.h
@@ -15,17 +15,9 @@ You should have received a copy of the GNU Lesser General Public
 License along with NeoPixel.  If not, see
 <http://www.gnu.org/licenses/>.
 --------------------------------------------------------------------*/
+#pragma once
 
-#ifndef NEOPIXELBUS_H
-#define NEOPIXELBUS_H
-
-#if (ARDUINO >= 100)
 #include <Arduino.h>
-#else
-#include <WProgram.h>
-#include <pins_arduino.h>
-#endif
-
 #include "RgbColor.h"
 
 // '_flagsPixels' flags for LED _pixels (third parameter to constructor):
@@ -125,4 +117,3 @@ private:
 
 };
 
-#endif // NEOPIXELBUS_H
diff --git a/RgbColor.h b/RgbColor.h
index 48aa81c..fc3ca1f 100644
--- a/RgbColor.h
+++ b/RgbColor.h
@@ -13,16 +13,9 @@ You should have received a copy of the GNU Lesser General Public
 License along with NeoPixel.  If not, see
 <http://www.gnu.org/licenses/>.
 --------------------------------------------------------------------*/
+#pragma once
 
-#ifndef RGBCOLOR_H
-#define RGBCOLOR_H
-
-#if (ARDUINO >= 100)
 #include <Arduino.h>
-#else
-#include <WProgram.h>
-#include <pins_arduino.h>
-#endif
 
 // ------------------------------------------------------------------------
 // RgbColor represents a color object that is represented by Red, Green, Blue
@@ -95,5 +88,3 @@ struct RgbColor
 	uint8_t B;
 };
 
-
-#endif // RGBCOLOR_H
\ No newline at end of file