Hello all, i'v found this little smart bug/exploit a while ago, i haven't found any thread similar to this. So here it goes.
If you play on a high populated server, you know the frustration of standing and retrieving your mailbox items/gold in slow-motion due to the lag..
I have found a solution to this, this mailbox is always INSTANT and can be found next to the Auction house in Orgrimmar.
I have tested this on several servers and different times of the day. Its always instant to retrieve mail and items.
Look on the pictures to get the position of the instant mailbox.
I don't know if its a "exploit" but i consider it to be quite good during high pop server peak hours.