We are working to port our old website over to kentico. The naming convention of our pages are different. For example; oldsite.com/about.aspx | newsite.com/en/about/ (extension-less). We are attaching aliases on each new page that match our old site. So kentico will have an alias on the page newsite.com/en/about/ of newsite.com/about

My question is, how much will this slow down our site. I know that each page load will need to run through these rules before displaying the final content. If we end up having 500 site wide aliases, will this hurt our performance?

Also, would it be better to utilize IIS URL Rewrite as opposed to the kentico alias?

Thanks