diff --git a/mik32_upload.py b/mik32_upload.py
index 6b9798d..028b1db 100644
--- a/mik32_upload.py
+++ b/mik32_upload.py
@@ -25,6 +25,8 @@ openocd_scripts_path = os.path.join("openocd", "share", "openocd", "scripts")
 openocd_interface_path = os.path.join("interface", "ftdi", "m-link.cfg")
 openocd_target_path = os.path.join("target", "mik32.cfg")
 
+openocd_default_speed = 500
+
 supported_formats = [".hex"]
 
 
@@ -161,6 +163,7 @@ def upload_file(
         openocd_scripts=openocd_scripts_path,
         openocd_interface=openocd_interface_path,
         openocd_target=openocd_target_path,
+        openocd_speed=openocd_default_speed,
 ) -> int:
     """
     Write ihex or binary file into MIK32 EEPROM or external flash memory
@@ -202,8 +205,10 @@ def upload_file(
             f"{openocd_exec} -s {openocd_scripts} "
             f"-f {openocd_interface} -f {openocd_target}", posix=False
         )
+        # proc = subprocess.Popen(
+        #     cmd, creationflags=subprocess.CREATE_NEW_CONSOLE | subprocess.SW_HIDE)
         proc = subprocess.Popen(
-            cmd, creationflags=subprocess.CREATE_NEW_CONSOLE | subprocess.SW_HIDE)
+            cmd, creationflags= subprocess.SW_HIDE)
 
     with OpenOcdTclRpc(host, port) as openocd:
         pages_eeprom = segments_to_pages(list(filter(
@@ -241,6 +246,8 @@ def createParser():
         '--openocd-host', dest='openocd_host', default='127.0.0.1')
     parser.add_argument('--openocd-port', dest='openocd_port',
                         default=OpenOcdTclRpc.DEFAULT_PORT)
+    parser.add_argument('--openocd-speed', dest='openocd_speed',
+                        default=openocd_default_speed)
     parser.add_argument('--keep-halt', dest='keep_halt',
                         action='store_true', default=False)
     parser.add_argument(
@@ -272,6 +279,7 @@ if __name__ == '__main__':
             openocd_scripts=namespace.openocd_scripts,
             openocd_interface=namespace.openocd_interface,
             openocd_target=namespace.openocd_target,
+            openocd_speed=namespace.openocd_speed,
         )
     else:
         print("Nothing to upload")