Bad city lag

[Yoder_of_Kansas]

Has anyone else gotten bad lag or FPS in the cities? I normally run 60+ FPS and as soon as I get into Ul'dah or the other two cites, my FPS drops to 10-15, even though no one is on the screen but me and a few others. Haven't had any issues when I played last weekend.

EDIT: Seems the new version of Firefox (24.0) is the culprit. 16 tabs over three windows still has a small drop. Not sure why.

EDIT THE SECOND: Still get lag even when Firefox is closed now, so that might not be it. Seems to happen only in towns or if there's more than three or four other players around me.