If you have an HTML Internet site, it likely uses a small amount of resources because it is static, but this isn't the case with dynamic database-driven Internet sites that use PHP scripts and provide way more features. This kind of sites generate load on the website hosting server every time somebody browses them, as the server requires time to execute the script, to access the database and then to deliver the info requested by the visitor's browser. A popular discussion board, for instance, stores all usernames and posts inside a database, so some load is created every time a thread is opened or an end user searches for a given term. If many people connect to the forum all at once, or if each search involves checking hundreds of thousands of database entries, this may generate high load and affect the functionality of the Internet site. In this regard, CPU and MySQL load stats can present you with data about the site’s performance, as you can compare the numbers with your traffic stats and see if the site has to be optimized or migrated to a different sort of website hosting platform that will be able to bear the high system load in the event that the site is really popular.