Perefect engraving results require extra time when laser engraving.
Selecting a different resolution ensures that you save engraving time. For large-scale engravings, for example, choose a lower resolution and compensate for the resulting line spacing with a higher Z offset value.
Consistent engraving result - 1/4 of the original processing time
Find below an example of how you can engrave the same graphic at 500dpi with the same result at 125 dpi in just 1/4 of the time: