The fix which only requires you to change 2 small things in the windows registry allows your ping in World of Warcraft to drop by 100-150, and it only takes about 5 minutes to apply.
This fix has been circulating trough various forums for a while, and at first I must say I was a little sceptical about it actually working, but after I heard several friends who tried it successfully, I had to give it a shot and it actually lowered my 200 ping on the European realms to about 70. Basically it's deactivating the nagle algorithm to improve your ping.
Step 1 - TcpAckFrequency
This works fine under Windows XP
Type "regedit" in windows "run.." dialog to bring up registry menu
Then find:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic
es\Tcpip\Parameters\Interfaces\
There will be multiple NIC interfaces listed in there, find the one you use to connect to the internet, there will be several interfaces listed (they have long names like {7DBA6DCA-FFE8-4002-A28F-4D2B57AE8383}. Click each one, the right one will have lots of settings in it and you will see your machines IP address listed there somewhere. Right-click in the right hand pane and add a new DWORD value, name it TcpAckFrequency, then right click the entry and click Modify and assign a value of 1.
You can change it back to 2 (default) at a later stage if it affects your other TCP application performance. it tells windows how many TCP packets to wait before sending ACK. if the value is 1, windows will send ACK every time it receives a TCP package.
Step 2 - TCPNoDelay
This one is pretty simple (Discussed here)
Type "regedit" in windows "run.." dialog to bring up registry menu
Then find:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Paramet
ers
Right-click in the right hand pane and add a new DWORD value, name it TCPNoDelay, then right click the entry and click Modify and assign a value of 1.
Click Ok and close the registry editor, then reboot your PC.
I've tested this myself, and I now find myself actually hitting people with my charge/intercept without them first riding/running 8-10 meters away from me before stopping. I've cut my latency down with around 150 !! (I have 30-40 latency in bg and arena now).
This still works, even though Blizzard crew says it has been patched.
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