Comment by Ballas

A lot of time can be wasted with poor debounce implementations. Cherry switches claims <8ms bounce IIRC, but you only need to debounce one of the edges. So as soon as you see the key start bouncing, you know it is activated, so you can immediately register the press, then do debounce. That way you only delay the registration of the release. By using a shift register you can also minimize it to the actual bounce time, not a predetermined delay. I (personally) don't know of any commercial keyboards that implements it this way, but given that their software is closed source, it is very possible that some do use this algorithm.