CPU, or Central Processing Unit, is that component of a PC or a server that carries out the calculations. Every CPU functions at a specific 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 enable them to be performed quicker, which will greatly contribute to the overall user experience. The more recent generations of CPUs have 2 and more cores, each of them operating at a particular speed to guarantee a much better and speedier performance. This sort of architecture allows the processor to control a variety of processes simultaneously or a number of cores to address one process if it needs additional computing power in order to be executed. Needless to say, other elements including the amount of RAM or the connection which a particular web server uses could also affect the overall performance of the web sites hosted on it.