K, so here is what a player who is using a minor speedhack looks like in a spar:
The spar is not exactly entertaining, but it's a good one to record because he is sparring a player who is in Japan and delays very badly. This is going to cause him to move around and C-slash a lot, and you'll see what I mean. The video isn't recorded at any amazing FPS, just something I quickly put together as I saw him sparring.
The main difference between knowing someone is speedhacking and assuming someone is speedhacking is the speed at which they can slash. There are a lot of sparrers that seem to have very responsive and clean clients that might make it appear as if they are moving faster than you. Some players move in diagonals a lot and that also makes them appear faster. When someone uses one of these speedhacks, it's ticking up the speed of everything. If you pay attention to how quickly he's able to swing, move, swing, it's very obvious. If you've sparred long enough, even very slight speed increases are clear to the naked eye.
Speedhacking in spars was at one time a big problem on PC Graal, and hopefully it doesn't get blown out of control on here. This idiot is 100% speedhacking and should probably be banned. I've reported him numerous times, and I've actually never seen a single person complain about his speed after losing to him, so that's why I'm posting this here.