I added Rapid Plunge to my post processor and now use Z1 and Z2. Set them to 0.8 clearance and 0.2 plunge. I might even change plunge to 0.1.
It fast plunges from 0.8 to 0.2 and then slows to the speed settings specified for that bit. They ought to make it standard; my job ran much faster
To try it just copy your post processor file from the PostP directory to the My_PostP directory. Change the lines near the beginning to the the file to like these
POST_NAME = “Shapeoko (mm) Rapid Plunge (*.gcode)”
FILE_EXTENSION = “gcode”
UNITS = “MM”
RAPID_PLUNGE_TO_STARTZ = YES