The CPU load depends on the amount of time a server spends executing a script every time a visitor opens a page on a particular script-driven Internet site. Static HTML Internet sites use hardly any CPU time, but it's not so with the significantly more advanced and functional scripts, that use a database and display dynamic content. The more customers open this sort of a site, the more load will be created on the hosting server and if the database is large, the MySQL server will be loaded as well. A good example of what may cause high load is an online store with a large number of products. If it is popular, a lot of people shall be browsing it concurrently and if they look for items, the whole database which contains all the products will also be continuously accessed by the script, which will result in high load. In this light, having CPU and MySQL load data can provide an idea of how the website is doing, if it needs to be optimized or if you simply need a more powerful hosting solution - if the website is really popular and the existing setup can't handle the load.