CPU, or Central Processing Unit, is that element of a PC or a web server which carries out all of the calculations. Every CPU functions at a specific speed and the larger it is, the quicker everything will be processed, so when you host resource-demanding web programs on a server, for example, a powerful processor shall allow them to be carried out quicker, which will considerably contribute to the whole user experience. The current generations of CPUs have two and more cores, each working at a specific speed to ensure a better and swifter performance. This kind of architecture makes it possible for the processor to control numerous processes simultaneously or a number of cores to manage a single process if it requires more computing power to be performed. Naturally, additional factors such as the amount of RAM or the connection which a specific web server uses could also affect the efficiency of the sites hosted on it.