This amuses me. In my experience I haven't seen any porn site player being faster or better than youtube; or may be I have too little experience to make a judgment on this. I find the fast-forwarding on youtube most efficient when compared to other video playing sites on web. The switching between full screen and half screen acts cranky at times, but other than that youtube videos run just fine. Also, many players don't even allow fast forwarding.

The main difference I can see that adult site have is the .gif previews as this can distinguish the fake from the rest. Also you cant see any troll videos on adult sites.