I remember the old days, OT 7.1, I was ACTUALLY using speed hack back then, and I ran waaay faster than GM's. They had a hard time banning you back then also, because they had to be right beside you, so you just ran away from them and even if you got banned, it worked pretty much like just getting kicked. But it didn't take that long until speed hacking wasn't possible anymore.
And anyone suggesting to use Cheat Engine for speed hacking, it doesn't work, not even a tiny bit. I've tried several times on OT:s and even on real Tibia, and I wasn't quicker at all. I have even tried that function in a few other games and it doesn't work, because it's a client sided function.