CPU, or Central Processing Unit, is that component of a PC or a server that executes all the calculations. Each CPU operates at a certain speed and the larger it is, the swifter everything will be processed, so if you host resource-demanding web programs on a web server, for instance, a fast processor will enable them to be carried out quicker, which will considerably contribute to the entire user experience. The modern generations of CPUs have 2 and more cores, each of them running at a certain speed to guarantee a better and swifter performance. This type of architecture allows the processor to control numerous processes simultaneously or several cores to manage one process if it requires more computing power in order to be carried out. Obviously, additional factors including the amount of RAM or the connection which a given server uses can also affect the overall performance of the sites hosted on it.