Our script is using PHPFastCache - http://www.phpfastcache.com - which reduces huge peace of the server load.

For example:
Your website has 10,000 visitors who are online, and your dynamic page has to send 10,000 times the same queries to database on every page load. With phpFastCache, your page only sends 1 query to your DB, and uses the cache to serve the 9,999 other visitors.

This allows the script to run even on shared hosting servers.