I’ve been plagued for some time with high latency rates while playing WoW under Windows 7, which somewhat by default delays some packets sent over the network. Here’s something to resolve it :

(Just a warning, the registry editor is a powerful tool that could help as well as crash your windows, don’t tinker with it if you don’t know what you are doing)

1. Open up the registry editor by running Regedit.exe

2. Go to the sub items under :
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces]

3. There will be some sub-items with lots of numbers under it, click through those items and look particularly for the sub-item with the following entries :
AddressType, DhcpGatewayHardware, EnableDeadGWDetect,T1, T2 and the like.

4. Now under the registry editor menu, click EDIT, then NEW, then create two “DWORD (32-bit value)”. It will add new registry keys namely New Value #1 and New Value #2.

5. Rename New Value #1 and #2 to TCPAckFrequency and TCPNoDelay respectively.

6. Assign a value to the new registry keys by double-clicking the keys and set the Hexadecimal Value to 1

7. Restart and enjoy.

Leatrix Latency Fix is another one I found useful and more user friendly to use than manually setting it, you can download it here

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