The CPU load depends on the length of time a server spends executing a script any time a visitor opens a webpage on a given script-driven Internet site. Static HTML Internet sites use barely any CPU time, but it's not so with the far more sophisticated and functional scripts, which use a database and display dynamic content. The more people open this kind of a site, the more load shall be generated on the hosting server and if the database is big, the MySQL server will be loaded too. An illustration of what may cause high load is an Internet store with a huge number of products. If it's popular, a lot of people will be visiting it concurrently and if they search for items, the entire 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 give you an idea of how the website is doing, if it needs to be optimized or if you simply need a more potent hosting solution - if the Internet site is very popular and the current setup cannot handle the load.