Ya, it's called higher ping.
What
Sgt. Weirdo is trying to say is, if you slow down the game, only your client on your computer will be going slow. Everybody else will on there comps and in game will be going normal speed. So what happens when you try to FB somebody, their not there anymore because of the time shift. It won't make you FB any better, just worse. You wouldn't want to slow down the game.
Just practice more.
Goto jail and fight friends or PK arena or just FB mobs every chance you get.
Make sure you have shadows set to simple or use a
Manual
Aim
Bot. Which changes the color of shadows and adds a cross hair.