Tried out the "WOW Latency Reducer"

Got the below wholesale from Oak's post in guild forum (I got his permission to post it) =)

To get low pings with 2 simple registry hacks do the following (you need to do both settings for the maximum effect)

1 - TcpAckFrequency - NOTE if you are running Windows Vista this setting may not have any effect - a hotfix is needed which i'm tracking down (can anyone point me the right way?). 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.

2 - TCPNoDelay
This one is pretty simple

info here: Microsoft Corporation

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.

[EDIT] Some people it seems don't have a MSMQ entry in their registry. You will need to add it, to do this the simplest way is to copy/paste the below code into a empty text file, and save it as a .reg file (just call it msmq.reg). Once done right click the file and select MERGE and click yes to the box that follows.

******snip below******

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Paramet ers]
"TCPNoDelay"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Paramet ers\OCMsetup]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Paramet ers\Security]
"SecureDSCommunication"=dword:00000000

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Paramet ers\setup]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Setup]

******snip above******

Click Ok and close the registry editor, then reboot your PC.

In fact, I did not have MSMQ entry in my registry, was very scared to add it...but if you just follow the instructions above, its done easily =)

My wow latency went down to 350 plus from the normal 500 plus in dalaran!! cool!!