If you're scrolling through tracks and you turn and load a track to quickly, it will not load the track you've selecting. I'm guessing the delay is implemented to handle double clicking the knob for instant doubles, but it should be smart enough to know that the knob was turned between clicks and just load the next track that is selected. This gets really annoying if you're trying to move quickly through your library and now you have to slow down because the software isn't smart enough to notice that the knob was rotated. I also noticed that if you rotate the selection knob to another track, press it and then quickly press the selection knob on the other deck it will instant double the track to the other deck - in other words, it's recognizing the selector knobs being pressed one after the other as a double click.
Anyways, here's a video of the annoying behavior described above:
Watchwww.youtube.com
You'll notice when I slow down that the track actually changes, otherwise the press is not registered.