I was playing on Saturday a bit with it around.
I had the back-plate of the printer.
Normal milling with 1 mm steps 10 mm deep was 970 lines of code
The same plate witch trochoidal milling in 2 x 5mm steps went to 470000 lines of code
Then another try with the full 10mm and the oscillator switched off was something around 340000 lines if I recall well.
All done with CNC.js over a Raspberry, (don’t remember if it was the Pi2 or Pi3). I doubt that connecting to the Pc makes a difference in speed.
I looked at my g-code and it looks similar to the one posted.
I might be wrong on this but I doubt that any speed adjustments in the g-code would do any difference. Those moves are so tiny that they moving constantly within acceleration deceleration ramps. So my guess is to try adjustments there, but that will most probably result in odd behaviour for normal operation.