The CPU load depends upon the time period a hosting server spends executing a script when a visitor opens a page on a certain script-driven Internet site. Static HTML Internet sites use barely any CPU time, but it is not so with the considerably more complex and functional scripts, which use a database and display dynamic content. The more individuals open this type of a site, the more load shall be produced on the web server and if the database is large, the MySQL server will be loaded as well. A good example of what could cause high load is an online store with a huge number of products. If it's popular, plenty of people shall be visiting it simultaneously and if they seek out items, the whole database that 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 stats will offer you an idea of how the Internet site is doing, if it has to be optimized or if you simply need a more powerful hosting solution - if the website is very popular and the existing setup can't deal with the load.