ASP.NET 2.0 Web app using C#

Hi - I am thinking of leaving Tracing on in our production environment at
all times. I can add some code such that the Tracing information is only
shown (at the bottom of the page) when you log in with a special role (user
group). This logic I will have to code on the system.

But my question is. Is it a good idea to leave Tracing on in a prod
environment? What are the concerns? Are there any performance degradation?

Is there a way I can only limit the performance degradation to a selected
set of users?

Thanks!