How to reduce your lag

First go Start ----> run and type regedit

Then open HKEY_LOCAL_MACHINE
+SYSTEM
+CurrentControlSet
+Services
+Tcpip
+Parameters
+Interfaces
When you open Interfaces sub folder will see 4 other folders
find here a file with name DhcpIPAddress.
Make a new Dword file with name TcpAckFrequency (you have to write it like that)
then right click on file go to configure and change value from 0 to 1 Done with OK
Restart your computer and your ms in wow reduce about 80-100
( Its working with all online games )

Cheers

Ty. Turiel ... But this Dword dosent work after 2.3 or 2.4 cuz that setting is disabled by default for blizz servers.
; )