diff --git a/k3ng_rotator_controller/k3ng_rotator_controller.ino b/k3ng_rotator_controller/k3ng_rotator_controller.ino
index e1e08ca..9e610e8 100644
--- a/k3ng_rotator_controller/k3ng_rotator_controller.ino
+++ b/k3ng_rotator_controller/k3ng_rotator_controller.ino
@@ -368,6 +368,9 @@
     2018.03.11.01
       GPS performance tweak - now ignoring gps_data_available and reading all data available on GPS port
 
+    2018.03.14.01
+      SET_I2C_BUS_SPEED in settings file; set I2C bus speed to help address I2C I/O time impact serial port performance
+
 
     All library files should be placed in directories likes \sketchbook\libraries\library1\ , \sketchbook\libraries\library2\ , etc.
     Anything rotator_*.* should be in the ino directory!
@@ -378,7 +381,7 @@
 
   */
 
-#define CODE_VERSION "2018.03.11.01"
+#define CODE_VERSION "2018.03.14.01"
 
 #include <avr/pgmspace.h>
 #include <EEPROM.h>
@@ -7436,6 +7439,11 @@ void initialize_peripherals(){
     ethernetserver0.begin();
   #endif //FEATURE_ETHERNET
 
+  #ifdef SET_I2C_BUS_SPEED
+     TWBR = ((F_CPU / SET_I2C_BUS_SPEED) - 16) / 2;
+  #endif
+
+
 } /* initialize_peripherals */
 
 
diff --git a/k3ng_rotator_controller/rotator_settings.h b/k3ng_rotator_controller/rotator_settings.h
index 87c4692..110ea08 100755
--- a/k3ng_rotator_controller/rotator_settings.h
+++ b/k3ng_rotator_controller/rotator_settings.h
@@ -336,4 +336,6 @@ You can tweak these, but read the online documentation!
 #define AUDIBLE_ALERT_AT_AZ_TARGET 1
 #define AUDIBLE_ALERT_AT_EL_TARGET 1
 
+//#define SET_I2C_BUS_SPEED 800000L // Can set up to 800 kHz, depending on devices.  800000L = 800 khz, 400000L = 400 khz.  Default is 100 khz
+
   
diff --git a/k3ng_rotator_controller/rotator_settings_ea4tx_ars_usb.h b/k3ng_rotator_controller/rotator_settings_ea4tx_ars_usb.h
index b7ef91e..43a7686 100755
--- a/k3ng_rotator_controller/rotator_settings_ea4tx_ars_usb.h
+++ b/k3ng_rotator_controller/rotator_settings_ea4tx_ars_usb.h
@@ -325,3 +325,6 @@ You can tweak these, but read the online documentation!
 #define AUDIBLE_ALERT_AT_STARTUP 1
 #define AUDIBLE_ALERT_AT_AZ_TARGET 1
 #define AUDIBLE_ALERT_AT_EL_TARGET 1  
+
+//#define SET_I2C_BUS_SPEED 800000L // Can set up to 800 kHz, depending on devices.  800000L = 800 khz, 400000L = 400 khz.  Default is 100 khz
+  
diff --git a/k3ng_rotator_controller/rotator_settings_m0upu.h b/k3ng_rotator_controller/rotator_settings_m0upu.h
index 9df7502..8f2f16a 100755
--- a/k3ng_rotator_controller/rotator_settings_m0upu.h
+++ b/k3ng_rotator_controller/rotator_settings_m0upu.h
@@ -326,3 +326,5 @@ You can tweak these, but read the online documentation!
 #define AUDIBLE_ALERT_AT_AZ_TARGET 1
 #define AUDIBLE_ALERT_AT_EL_TARGET 1
   
+//#define SET_I2C_BUS_SPEED 800000L // Can set up to 800 kHz, depending on devices.  800000L = 800 khz, 400000L = 400 khz.  Default is 100 khz
+  
diff --git a/k3ng_rotator_controller/rotator_settings_test.h b/k3ng_rotator_controller/rotator_settings_test.h
index 2417696..5a9c9b1 100755
--- a/k3ng_rotator_controller/rotator_settings_test.h
+++ b/k3ng_rotator_controller/rotator_settings_test.h
@@ -346,6 +346,8 @@ You can tweak these, but read the online documentation!
 #define AUDIBLE_ALERT_AT_AZ_TARGET 1
 #define AUDIBLE_ALERT_AT_EL_TARGET 
 
+//#define SET_I2C_BUS_SPEED 800000L // Can set up to 800 kHz, depending on devices.  800000L = 800 khz, 400000L = 400 khz.  Default is 100 khz
+
 
 									// ######## ########  ######  ######## 
 									//    ##    ##       ##    ##    ##    
diff --git a/k3ng_rotator_controller/rotator_settings_wb6kcn.h b/k3ng_rotator_controller/rotator_settings_wb6kcn.h
index 6a5b22b..1e7a266 100755
--- a/k3ng_rotator_controller/rotator_settings_wb6kcn.h
+++ b/k3ng_rotator_controller/rotator_settings_wb6kcn.h
@@ -327,4 +327,7 @@ You can tweak these, but read the online documentation!
 #define AUDIBLE_ALERT_AT_STARTUP 1
 #define AUDIBLE_ALERT_AT_AZ_TARGET 1
 #define AUDIBLE_ALERT_AT_EL_TARGET 1  
+
+//#define SET_I2C_BUS_SPEED 800000L // Can set up to 800 kHz, depending on devices.  800000L = 800 khz, 400000L = 400 khz.  Default is 100 khz
+
   
\ No newline at end of file