I think it is the acceleration setting in the firmware. The max stock feedrate is 197mm/s so you are basically 60x’s below that. For milling the acceleration is low so it doesn’t jerk the heavy tool around on sudden moves. The laser gcode probably has a ton of speed changes, constantly hitting the jerk and accel limits.
A quick experiment would be set the speed to double what you have it now and run the machine at 50% feedrate.