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There are various tunnel systems that you can use.
"Reducethelag", "wowtunnels", there are lots, they are just the two I know of off the top of my head. However, recommending any of them could be against the EULA, so I am not recommending one.
It is not against regulations to use a tunnel to connect to WoW that I know of.
Not going to bother with the theory behind tunnelling, but basically the idea is that theoretically you get a better (reduced) lag time if you connect to WoW using a tunnel.
Reduced lag time means you do more damage, more healing, generate more threat, herb/skin/etc faster.
(as an example, if your lag time is normally 800ms, and a tunnel reduces your lag to 200ms, then you will (in theory) gain 600ms each time you interact with the game (i.e. cast a spell, skin a mob, etc), meaning you will gain roughly half a second each interaction).
There is a lot more to it, and the purists would probably hang, draw and quarter me for the above. However, that will give you a general idea.
Something to keep in mind, you may not experience ANY reduction in your lag if you use a tunnel. It does depend on a lot of factors, including your ISP, your connection type, the quality of your connection to the internet as a whole, etc, etc, etc.
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