I've been having performance issues with a high traffic ASP.NET 2.0 site running on Windows 2000. While editing the web.config file I noticed that the authentication mode was set to 'Windows'. I changed it to 'None'. The only users this site has are anonymous and it gets 25,000+ page views at day. Could this have been a caused performance issues?
There is a small potential, but if you are not securing any folders, it shouldn't be an issue.
In reality it would mostly be an issue if you needed to secure a folder path.
There might be a SMALL performance hit but I can't imagine it would be that bad.