Yea, as far as i know you cannot even delay a given mysql query to perform xx minutes later.
What you may observe on other lists is cache, not memcache ( hard to configure ), but normal website content cache.
Serves a cached version of the site from 5 minutes ago, 5 mutes later grab a fresh copy.
Myself no experience with it, but i believe cloudflare lets you set up custom rules to only cache specific site content, such as rankings.php only
That way ranking is cached, but the rest of the site keeps instant update ( important for login for example )