CPU, or Central Processing Unit, is that element of a home PC or a server that performs all of the calculations. Every CPU operates at a certain speed and the larger it is, the faster everything shall be processed, so in case you host resource-demanding web applications on a web server, for example, a quick processor shall enable them to be executed much faster, which will tremendously contribute to the entire user experience. The modern generations of CPUs have 2 and more cores, each of them running at a particular speed to guarantee a superior and faster performance. Such architecture makes it possible for the processor to control different processes all at once or several cores to control a single process if it needs more computing power in order to be carried out. Naturally, other elements including the amount of RAM or the connection which a certain server uses can also affect the overall performance of the sites hosted on it.