I am completely aware of the slider in Interface options (it's turned all the way DOWN to lowest). My windows sensitivity is perfect and I am 100% certain that there is no other profile loading for the mouse (Razer has profiles that can change sens on the fly and so on). I force this by ensuring that the default (or another, I've tested multiple) profile gets loaded everytime I run WoW.exe. I also try without profiles. The same problem always occurs.
I'm running it at 1200 DPI and in Windows 7 x64 my "pointer speed" slider is at 3 out of 11.
My previous mouses/mice (Microsoft IntelliMouse 3.0 and Razer Deathadder) did not have the same issue at all. WoW inherited the windows + driver cursor speed/sens without having to bother about the ingame pointer speed slider.
This is driving me nuts, to the point where I'm actually considering returning the mouse and getting another Deathadder/MSI3.0.
Any tips? Any knowledge? Please help!
I did as you said, tried on a fresh install of the game and nothing changed. So! I took the Naga back and got another Deathadder. The problem is STILL there. With or without razer's own driver installed. This seems like a razer-related issue, but thought it was worth rapporting here too.
Then I went in-game and typed /console mouseSpeed 0.25. I think it worked for me, I had to log off right after that so I can't confirm this. But it felt like it was fixed.
P.S. when you set it to read-only it probably resets every other change you make in-game when you start your client again. I need to see if one can take the read-only option off after you made these changes.
P.S.S. Ok, I had to chance to look into it better now, making the config.wtf read only doesn't help at all, but typing /console mouseSpeed 0.25 (or whatever you find best) does slow it down.
And it resets everytime you log out, change character or even reload the UI.