To get fast hands – or feet, or what-have-you – you need to practice. Drills are great for this. Motions rolled into a cyclical fashion so you and your partner can cram lots of repetitions into a small period of time.
Here is Master Wong showing a wonderful drill. Though he does not name it, it is identical to Hoobud in Kali, but who knows who created it first, or whether it was independently developed by many systems.