CPU, or Central Processing Unit, is that part of a computer system or a web server which runs each of the calculations. Each CPU operates at a certain speed and the larger it is, the swifter everything will be processed, so when you host resource-demanding web apps on a web server, for instance, a quick processor shall enable them to be performed quicker, which will tremendously contribute to the overall user experience. The more recent generations of CPUs have 2 and more cores, each of them running at a specific speed to guarantee a better and quicker performance. This kind of architecture allows the processor to handle numerous processes simultaneously or several cores to address 1 process if it requires more computing power to be executed. Of course, other factors including the amount of RAM or the connection that a particular hosting server uses can also affect the overall performance of the websites hosted on it.