The CPU load is dependent upon the amount of time a web server spends executing a script when a visitor opens a page on a given script-driven Internet site. Static HTML sites use barely any CPU time, but it's not the case with the significantly more sophisticated and functional scripts, that use a database and display dynamic content. The more individuals open this type of an Internet site, the more load shall be produced on the web server and if the database is large, the MySQL server shall be loaded too. An illustration of what may cause high load is a web-based store with thousands of products. If it's popular, lots of people will be browsing it at the same time and if they seek out items, the entire database that contains all the products will also be continuously accessed by the script, resulting in high load. In this light, having CPU and MySQL load stats will give you an idea of how the website is doing, if it needs to be optimized or if you simply just need a more potent hosting solution - if the site is popular and the established setup cannot handle the load.