Run Pantheon Launch Check again in your Live environment and fix any issues. Use the link below that is appropriate for the Content Management System your website uses.
Pantheon
ITS recommends that all websites be behind U-M Cloudflare before they are migrated to Pantheon. If you integrate your website with Cloudflare, Cloudflare will handle a lot of the website's public visitor traffic without passing it on to Pantheon. This will result in Pantheon handling fewer visitors, in many cases reducing the size of the Pantheon rate plan you need and saving you money.
This document serves as a guide to help you make the most out of Site Lens and ensure your sites are consistently optimized. Enjoy exploring the new features and insights!