In High-quality mode, the laser travels across the entire width of the workpiece at the same speed whilst laser engraving only the defined areas. This means that the jobs are engraved at the same speed across the entire workpiece. The finished result is a homogeneous laser engraving.
When High-quality mode is not activated, the laser head typically travels at a higher speed over the width of the area to be engraved and not the full workpiece. This results in different exposure times, with laser engraving the material deeper in some places.
Summary: Always activate High-quality mode when a high-quality laser engraving result is required and time is not a critical factor.