How did this luminous from KMST teleport at such a high speed?

If you've observed how the game mechanics work, after you pot there is a slight delay before you can attack or do anything else. There is a short delay after every manual loot. There is a short delay after every attack when changing to another attack (e.g. cast a spell, then try to twack). The same for teleport. There probably is a server response packet that must reach the client before your character can perform another action.

Advantage is accountability and some amount of hack tracing. Disadvantage is... well... massively influenced by ping rate, and very easily counter-hacked, and obviously DDoS.

Hadriel