mouse input laggy

When I have both occlusion and shadow maps turned on, I experience some mouse input lag.

Nothing horrible, enough to mechanically grow accustomed.

Now, the funny thing is that the mouse graphic is not laggy, just the effects of the mouse.

The mouse graphic is always up to date, but the object highlighted, the camera turning, and the GUI interaction is laggy.

Now, clicking is never laggy, but mouse movement is.

So

Cursor - good
Cursor location - good
Mouse click - good
Mouse over effect - lag
Camera adjustment by mouse - lag

If you turn on /showfps 5 in game, what sort of FPS does it say you're getting?

(the 5 will make it average over a 5 second period, you can use a different number, with 0 turning it off)

We've been saving Paragon City for eight and a half years. It's time to do it one more time.