@dc42 many thank's!
I add this line in my config.g
; Set Cartesian type and segment interval one second and length 3mm
M669 K0 S1 T3
In the middle of a 200mm straight cut the pause will be done within the second and move set with M669
So this works and I will add this line to my CNC too, btw. I do not see any slowness in normal cut and engrave jobs too.