This is not a speed, you left out a few key variables, 30 what over what? miles per hr? mm/sec, inches/min? All are very different and required to understand your settings.
You have a diode laser, and they cut very slowly as they emit low-energy power to the cuts you program. They also reflect off lighter color surfaces, so if you are trying to cut white paper as an example, you will get poor results. So keep that in mind.
Having a tight focus point is essential to maximize the cutting power of these units. You should also consider the thickness of the material to be cut and the shape of the beam. The beam shape is like an hour-glass when viewed from the side. The “hottest” spot of the beam is the thin center of the hour-glass shape. That point is where all the cutting power is, so if you want to cut thicker material, moving that ‘hotspot’ deeper into the material (this would require lifting the material or moving your Z axis) helps when cutting thick items, but there is a limit to these systems.
Additionally, we would need to know what firmware you are using and what settings for that firmware you have set currently to offer much more.
Here is a general “How do I get it to work” for the 3018 CNC style setups that might be worth review.