Hercules and Icarus firmwares have been updated with new acceleration and jerk values.
Previously they were reduced, based on recommendations from the extruder developer. Naturally, this slows down the print time unless you bump up the print speed too.
I have reverted the values back to stock. Download the firmware again and print the gcode or execute this command (save it as a .gcode and print):
; Acceleration and Jerk
M8007 I15; Jerk
M8008 I1000; Acceleration X / Y
; Save
M8500; Save changes
You can experiment with acceleration a little if you like, up to 2000 should be fine. I would not change jerk too much.