Disabled constraints still being calculated? I ran into an issue where an Eye rig setup to track a camera using bone constraints was causing performance issues. Each eye had a bone with an IK constraint targeting a gaze control bone, which had a Copy Location bone constraint set to copy the Camera.

When I move the camera, the viewport lags badly, even with a relatively simple character. What is strange is that the performance drop continues even if I disable the copy location constraint by unchecking the Eye icon on the constraint panel. This suggests that the constraint is still being calculated even when it is disabled.

Is this correct, and is there any way to deal with this problem? Some of my rigs need a lot of constraints, and I don't want to be stuck with this performance problem when doing basic posing and scene composition.
It's not the constraint that's the cause. The common way to deal with this is to enable "simplify" and globally reduce the subdivision level while you're animating.