At first sorry for my bad english I'm from Austria but I try to explain

your move instructions of any single wow goes to the server and back to the other clients but you will see the movements of your character instant in this (and only this) wow
The other clients have to wait untill the instructions come back to the client

client -> server -> client

For example if you jump at the 1st client then you see the jump about 300ms later on the other clients

It is possible to move your chars almost synchron at a short distance but not for long