My brother in law and I both two box, he just started. Transfered his warlock off his main account and onto his second. Neither character has any movement speed increasing effects, and both our computers are around the same, spec wise(He has a faster processor(2.6 AMD athlon x2)). I don't have a problem having my priest follow my warrior on my 60% flyer, but if my brother in law has his characters following each other, one always lags behind and stops following, usually in about 50 yards.

I honestly have no idea why it is doing this, any thoughts?