Block Profiler shows render times for individual blocks and panel panes on each page request. Block timing requires a tiny core patch, included with the module.
Cache Control header is used to improve site performance for authenticated user when NginX is used. It send HTTP Cache Control header in those page allowed to be served in cache.
This is a basic drupal module.
Empties cached tables, rebuilds the menu cache and theme registries, and invokes a hook so that other modules' that cache data can be cleared as well.