Hope de accelerating is some sort of word and this is close enough place to post this.

I have currently V1.1f GRBL motion slowing down is issue when jogging, not when program is running. Didi use google and many other search parameters and seems like this was issue on GRBL 0.8

Lets say 1mm jog step is needed, machine performs ok. IF I decide to hit keyboard for second mm when machine or GRBL is slowing down, machine can lose most of this second mm. How much is missing depends what is left from previous mm. Hope somebody figures out what I´m trying to describe, might do short video to demonstrate this. My machine can run hours without losing any steps, but jogging ruins everything, steps might be missed before Zero point and tool change jogging will escalade thing to worse. I have homing switches, but those wont help if program zero is wrong all ready.