The document provides tips for improving Moodle site performance based on user roles. It suggests that teachers enable only necessary filters, resize images before uploading, and reduce sections/recent activity blocks. Moodle administrators should use performance reports, disable log legacy data, and reduce frontpage courses. System administrators can implement memcached, Opcache, compare session storage, and optimize hardware. Developers should reduce database queries in loops, join on indexes, and add caching. Moodle HQ ensures no regressions and looks for performance issues and more caches.