The CPU load is dependent upon the amount of time a server spends executing a script any time a visitor opens a webpage on a certain script-driven website. Static HTML Internet sites use barely any CPU time, but this isn't the case with the considerably more complex and functional scripts, which use a database and display dynamic content. The more people open this type of a site, the more load will be created on the server and if the database is big, the MySQL server will be loaded also. A good example of what may cause high load is an Internet store with a huge number of products. If it's popular, plenty of people shall be exploring it simultaneously and if they look for 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 provide you with an idea of how the site is doing, if it has to be optimized or if you just need a more efficient hosting solution - if the Internet site is very popular and the existing setup cannot handle the load.