Good point. Other people's addons could be causing you lag.
Originally Posted by Klogaroth
You can track how much you are spamming people with your addons and how much they are spamming you by getting [URL="http://wow.curse.com/downloads/wow-addons/details/fu-bar_addon-spam-fu.aspx"]Addon Spam[/URL]
This type of addon is great for monitoring who is contributing most to netwrok lag. I'll be using one tonight, but not the one linked. It's no longer supported. There's a link to the new addon that replaces it on the page Klog linked. It was very interesting the first time I it back in Wrath when people were having such problems. I'll be just as interested to see who is sending the most traffic tonight