CPU, or Central Processing Unit, is that component of a personal computer or a web server which runs each of the calculations. Every single CPU runs at a certain speed and the higher it is, the swifter everything shall be processed, so when you host resource-demanding web programs on a server, for example, a fast processor shall allow them to be carried out speedier, which will considerably contribute to the whole user experience. The current generations of CPUs have 2 and more cores, each one working at a specific speed to ensure a superior and quicker performance. This sort of architecture permits the processor to handle a variety of processes at one time or several cores to control one process if it requires more computing power in order to be carried out. Of course, other variables like the amount of RAM or the connection that a certain hosting server uses could also affect the overall performance of the web sites hosted on it.