The CPU load depends upon the amount of time a server spends executing a script each time a visitor opens a page on a given script-driven website. Static HTML sites use hardly any CPU time, but this is not the case with the significantly more advanced and functional scripts, which use a database and display dynamic content. The more people open this sort of an Internet site, the more load shall be generated on the web server and if the database is very large, the MySQL server shall be loaded too. An example of what may cause high load is an Internet store with a huge number of products. If it's popular, many people will be visiting it concurrently and if they seek out items, the whole database containing all of the products shall also be constantly accessed by the script, resulting in high load. In this light, having CPU and MySQL load statistics will provide you with an idea of how the Internet site is doing, if it has to be optimized or if you simply just need a more effective web hosting solution - if the Internet site is very popular and the existing setup can't cope with the load.