The CPU load depends on the amount of time a hosting server spends executing a script every time a visitor opens a page on a given script-driven website. Static HTML Internet sites use hardly any CPU time, but this is not so with the much more sophisticated and functional scripts, which use a database and display dynamic content. The more clients open such a site, the more load shall be generated on the server and if the database is very large, the MySQL server shall be loaded too. An example of what can cause high load is a web-based store with a large number of products. If it's popular, a lot of people will be browsing it simultaneously and if they look for items, the entire database which contains all the products shall also be frequently accessed by the script, resulting in high load. In this light, having CPU and MySQL load statistics will offer you an idea of how the Internet site is doing, if it needs to be optimized or if you just need a more efficient web hosting solution - if the website is popular and the existing setup cannot cope with the load.
