Hi all I use LaserWeb to engrave Picture of my classmate,

Hi all
I use LaserWeb to engrave Picture of my classmate, but it take too much time to do that
i set feed rate F=2000 mm/min but it run like 300mm/min.
What is the reason?, if you use G code generate by Laserweb, edit and add the command M5 at first ( it mean you turn off laser during all the process) and it run very fast. ???
(Sr my English is not good)

the problem is in grbl command line … check for it