I modified a Creality Ender 5 Plus to CoreXY, changed the complete hotend thingy to a DIY Volcano with a 60W heater, 0.6mm nozzle, Titan extruder with a 34mm long Nema 17 motor, 0.9 degree steppers on X and Y (or A and

, Klipper with MainSail, so now it can print over 10 times faster, or to be exact, a 24 hour print is done in 2:47 !
And the prints are much better as i can push the hot end to 300 C all day long, full metal. Printing PETG at 255 and PLA at 225, PETG looks like candy !

The little Voron Leagcy i built also uses Klipper et al, everything is the same as above except the extruder that is on a short bowden tube.
All in all, Ender is limited at 200mm/s and Voron at 170mm/s for now, acceleration at 5000 and 7000 respectively.
Creality limits acceleration at 500mm/s/s by default, and that is the most important part of the speed up, since printing small stuff the machine has no space to speed up and slow down much.