CPU, or Central Processing Unit, is that component of a computer or a hosting server which performs all of the calculations. Each CPU runs at a certain speed and the bigger it is, the swifter everything shall be processed, so when you host resource-demanding web applications on a server, for example, a quick processor shall allow them to be performed speedier, which will greatly contribute to the whole user experience. The newer generations of CPUs have two and more cores, each working at a certain speed to ensure a much better and faster performance. This sort of architecture makes it possible for the processor to handle different processes at one time or a number of cores to address one process if it needs more computing power in order to be carried out. Of course, other factors such as the amount of RAM or the connection which a given web server uses may also affect the overall performance of the websites hosted on it.