Hatch22 will analyze Master Lines and find those that are overlapping and collinear.
Those lines will all be merged into a single line definition.
This will result in a pattern definition with fewer redundant lines.
This makes it possible to create groups and detail families (such as Jigs) that have lines which when combined together overlap each other. You don't need to worry about the efficiency of this.
In this example a group has been made of a square drawn with hatch22 - Path

The interior red 'x' lines are for reference only and do not contribute to the pattern.
The group is repeated nine times creating overlaps at each end and lines with shared endpoints at each corner.
Without the Merge turned on, the resulting pattern would have 36 lines (9 x 4).

With Merge turned on, the resulting pattern has only 8;

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