The CPU load depends on the time period a server spends executing a script every time a visitor opens a webpage on a specific script-driven Internet site. Static HTML Internet sites use hardly any CPU time, but this is not so with the considerably more complex and functional scripts, which use a database and display dynamic content. The more individuals open such a website, the more load shall be produced on the server and if the database is large, the MySQL server shall be loaded as well. A good example of what can cause high load is an online store with a huge number of products. If it's popular, a lot of people will be exploring it at the same time and if they seek out items, the entire database which contains all of the products will also be constantly accessed by the script, resulting in high load. In this light, having CPU and MySQL load data will offer you an idea of how the Internet site is doing, if it needs to be optimized or if you simply just need a more efficient hosting solution - if the site is popular and the established setup cannot deal with the load.