If you have an HTML site, it probably uses a small amount of resources as it is static, but this isn't the situation with dynamic database-driven sites that use PHP scripts and provide a lot more functions. Such websites generate load on the web hosting server every time someone browses them, because the web server needs time to execute the script, to access the database and then to supply the data requested by the visitor's browser. A widely used discussion board, for example, stores all usernames and posts inside a database, so some load is produced any time a thread is opened or an end user searches for a particular phrase. If many people access the forum concurrently, or if each and every search involves checking tens of thousands of database entries, this may create high load and affect the efficiency of the website. In this regard, CPU and MySQL load stats can provide information about the site’s functionality, as you can compare the numbers with your traffic stats to make a decision if the site should be optimized or transferred to another type of hosting platform that will be able to bear the high system load if the site is very popular.