Optimising your site will help a lot of things, One being load time.

Caching database fetches or pre-fetching data saves time, and increases performance. Combines many fetches into one larger fetch requires a small performance hit initially, however because all the requred data is saved locally it does not require many small connections to be made periodically as the page load...which in turn means the page generally loads faster and at lower CPU (and I/O) usage.

Syncing data from server to server not only provides a great backup solution it also allows for load balancing. Instead of needing a one very expensive server, you can use two or more cheap servers on what would have been considered sub-par networks with an ending result being faster.

Utilizing other OS functions will generally improve every aspect of your site, keeping it maintained and running smooth.