This is something that has plagued us, as a guild, for a very long time: shitty internet connections from our ISP (internet service providers) to the Gorgonnash WoW server (which resides, physically, in Dallas, Texas). There are a lot of things that cause shitty internet connections: spammy addons, malware on our computers, your little brother torrenting porn, etc. 

However, we haven't really been able to gauge what exactly "shitty" means. Well, here's something visual and easy to understand:

http://www.pingtest.net/

Go, try it now and post your results here (via the "Direct Link" button they give you, using the little "Tree" button on the site text editor). This will give us a starting area to diagnose your shitty internet problems. Ensure that you choose the DALLAS, TX server on the map when given the choice. As an example, I have a "B" rating:

Let's see what you guys got.

edit: updated with my actual score without 1.5mb/s of torrents running :P

edit 2: For those of you whom don't know, every single raider should run this:

http://www.wowinterface.com/downloads/info13581-LeatrixLatencyFix.html

It's a simple, easy and safe way to lower WoW latency and possibly improve your performance. 

For those of you that wanted to use QoS (quality of service) on their routers, here are my settings (click, then click "original" to see 1:1 size):