At least 100% faster.
I increased print speed from 50 to 100 mm/s in Cura with no ill effect.
I think it could go faster still.
I did a detailed post here: https://stemgeeks.net/hive-163521/@apshamilton/upgrading-the-ender-3-pro-with-klipper-on-raspberry-pi4-skr-1-3-mainboard-and-tmc2209-drivers