Janome's version of .jef files contains front loaded jumps.

Janome:

• 80 01 00 00
• 80 02 7F BF (+127, -65)
• 80 02 7F BF (+127, -65)
• 80 02 7F BF (+127, -65)
• 80 02 7F BF (+127, -65)
• 53 D2 (+83, -46)

Pyembroidery:

• 80 01 00 00
• 80 02 76 C3 (+118, -61)
• 80 02 76 C3 (+118, -61)
• 80 02 77 C2 (+119, -62)
• 80 02 76 C3 (+118, -61)
• 80 02 76 C3 (+118, -61)
• 00 00 (0,0)

It maximizes the jump distance in one of the coords rather than calculates the travel distance, then how many jumps that would take, and then produces even sized jumps.

One could also maximize both coords until one value runs out then use 0 for that the rest of the jumps. This causes the machine to go either diagonal or vertical only.

This is of completely unknown utility.