As you know, playing World of Warcraft outside of the states have been a real battle for all of us in respect to latency. I personally am using services like lowerping.com or wowtunnels.com and found that they do improve my latency from ~300ms to about ~240ms.
While browsing through wowinterface.com, I’ve stumbled upon an addon that allows you to reduce your latency SIGNIFICANTLY. So I thought to myself, I have to give this a go.

So basically this addon is a VBS (Visual Basic Script) that implements a TCPack fix. I was abit skeptical at first, considering that it might be a script that sends my personal information to the creator but it’s all open source and you can view the script in a text editor (I’ve checked it myself and yes I’m a software developer so I know my shit!). If that still doesn’t make you feel comfortable using it, this addon is apparently endorsed by TankSpot.com (How To: Improve Your Arena Ratings) and it also includes an undo script in it.

Also note this improves your latency in all other online games you play, and works on Windows XP(SP2 and later), VISTA(SP1 and later), and Win7. This unfortunately does not work for Macs, but on the addon’s page he gives a simple command to run at mac prompt to make the same change. Below is the Mac equivalent

Is there a Macintosh version?
Leatrix Latency Fix isn’t supported on Macs. However, you can achieve lower latency in OSX by entering the following command in a terminal window. This will disable delayed acknowledgements until you restart your computer.

sudo sysctl -w net.inet.tcp.delayed_ack=0

To disable them permanently, create a text file under “/etc/” called “sysctl.conf” and copy/paste the following line then restart your computer.

net.inet.tcp.delayed_ack=0

To set things back to default, just delete the “sysctl.conf” file and restart your computer.

This means that Ronny, AKA Jhasmine, and my MacBook can benefit from lower latency as well!

Well enough talking Leo, where’s the addon?
Ok, without further a due, here is Leatrix Latency Fix