When a system is too slow, XXHighEnd will hardly work. This is because too many things need to happen in the background which by itself is because of it's memory play.
Tell me that your FLAC album loads in 4 seconds and I say nothing. But tell me that it takes 20 or more, and there you go.
A flac album loads in less than 20 sec. A 44.1/16 AIF loads quickly, like 5 or 10 seconds. An HD flac might take 20 seconds or more.
But the machine is fairly fast. xxHE moves along quite nicely, and I have never had problems with clicks (other than the documented ones sometimes at the beginning of a gapped track).
But this is not a question of speed, because I have clicked on NEXT and left it alone for long periods of time with no response (like going to eat dinner and coming back). STUCK. It does nothing.