These are the slight trouble spot to your last two traces:
6 * 29 ms 31 ms pos-3-8-0-0-cr01.56marietta.ga.ibone.comcast.net [126.96.36.199]
9 241 ms 51 ms 54 ms cr2.attga.ip.att.net [188.8.131.52]
2 15ms 1/ 100 = 1% 1/ 100 = 1% 184.108.40.206
5 61ms 1/ 100 = 1% 1/ 100 = 1% pos-0-9-0-0-cr01.charlotte.nc.ibone.comcast.net [220.127.116.11]
7 57ms 1/ 100 = 1% 1/ 100 = 1% pos-0-9-0-0-pe01.56marietta.ga.ibone.comcast.net [18.104.22.168]
There doesn't seem to be a pattern here, and these are even 2 different connection routes.
Do you know of anyone else in your area that is lagging in WoW? Do any of your guildmates or friends play in your area?
It may be worth it to have one of them bring their computer over to test playing on your network. Or it may be worth to move your computer over to where you can connect with an ethernet cable, and test playing, and see if there's a difference.
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