Was this using Meerk40t to engrave?
This type of pattern switches the laser machine into detailed engraving mode by increasing the number of laser head movements per task.
In simple engraving mode, the laser head moves 100 times in one task and then returns to the main starting point.
This type of pattern instructs the laser machine to make 25,000 laser head movements per task.
Some many people are trying to achieve best engraving results through replacing laserboard controllers without knowing that laserboard controllers as M2 Nano and M3 Nano have built-in language which when used, no need to upgrade lasertubes or some kind of other equipment.
That type of image shown by me when I first engraved it on my very old K40 Laser Machine, achieved excelent brilliant results on 85 mm/s with 22.9% laser power of my CO2 laser tube without hardware set PWM laser control.
Seems M2 laserboard controller interprets that type of design shown by me as M2 Nano switch from Basic Engraving Mode to Advanced Engraving Mode.