CPU, or Central Processing Unit, is that component of a computer system or a server which carries out all of the calculations. Each CPU operates at a certain speed and the bigger it is, the speedier everything will be processed, so if you host resource-demanding web programs on a hosting server, for instance, a fast processor will allow them to be executed quicker, which will drastically contribute to the whole user experience. The current generations of CPUs have 2 and more cores, each of them functioning at a particular speed to guarantee a superior and swifter performance. Such architecture allows the processor to manage various processes all at once or a number of cores to manage one process if it requires extra computing power to be executed. Obviously, other elements such as the amount of RAM or the connection that a given web server uses could also affect the overall performance of the web sites hosted on it.