I've seen your KA A320 zooming at breackneck speed on taxiway H only to slow to a walking pace halfway way down the taxiway!
KA A320s are equipped with the IAE engines which have much greater residual thrust at idle than the CFMs. The recommended taxi technique for the 320 with that engine is to let the aircraft accelerate to 30 knots before slowing it down in one to to 10/15 knots before letting it accelerate again. Riding the brakes heats them up and wears them quickly.