As concluded in original thread, seemed as though reinstall of SB3 took care of USB problems and all other issues, but this one is back:

Slow cuts.
First pass in pocketing or cutout now. Straight line cuts from 24-30" length dropping to about 1/4" per second cut speed. Last sheet was on table over 45 minutes for 8 cabinet sides.

Here are absolutes I can define from a closer study and noting of code lines:

ONLY happens on first cut of a new toolpath.
ALWAYS snaps back to full travel on next line of code and for remainder of cut.
NEVER slows over same section again.
CLIMB cut will be slow for first side of rectangle in clockwise direction
CONVENTIONAL cut will be slow for first side of rectangle in counterclockwise direction.

Does NOT happen on every cutout on toolpath, except this last sheet, which happened on all 8 pieces for final cutout pass (they were identical size cutouts).

Just verified again in partworks - no open vectors and no duplicate vectors in drawing.

Anyone have a clue at all?

jeff