CPU, or Central Processing Unit, is that part of a home PC or a server that performs each of the calculations. Every CPU runs at a specific speed and the larger it is, the speedier everything shall be processed, so in case you host resource-demanding web programs on a web server, for example, a quick processor shall allow them to be performed much faster, which will tremendously contribute to the entire user experience. The current generations of CPUs have two and more cores, each of them running at a particular speed to ensure a superior and swifter performance. This kind of architecture makes it possible for the processor to manage a variety of processes at one time or a number of cores to manage a single process if it needs more computing power in order to be performed. Needless to say, other variables like the amount of RAM or the connection a certain web server uses may also affect the performance of the web sites hosted on it.