Lag, but only on one character

[Lisset]

I've been having this problem with nasty graphical lag that occurs only on one character, my 35 rogue. It is also more noticeable during combat, whether I'm participating or not. It's particularly prominent when I mouse look around. It gets VERY jerky.

Nothing I do seems to change this or make it better. I've made sure that there are no spell effects on me and I've even removed all my equipment and put it in the inventory. Still no change.

The most peculiar aspect of this is that it doesn't happen on my other toons. I actually went so far as to take my enchanter to the same spot (on the same night) and another toon, my mage (one human, one gnome) and everything is as quick as ever. But back to the rogue and it's lag-city. And then to one of the other toons and it's fast again.

I've tried everything I can think of. This is all on the same computer and I've tried logging off and on, removing things in the back ground, etc. I'm on a windows 7 machine with a 6-core processor and 8gb RAM. I'm not using any EQ-related add-ons, legit or otherwise, including EQWin or whatever it's called.

Any suggestions of something I may not tried yet?