CPU, or Central Processing Unit, is that part of a computer system or a server that runs each of the calculations. Each CPU functions at a certain speed and the higher it is, the swifter everything shall be processed, so when you host resource-demanding web applications on a server, for instance, a quick processor will allow them to be carried out much faster, which will drastically contribute to the whole user experience. The more recent generations of CPUs have 2 and more cores, each of them functioning at a particular speed to guarantee a better and quicker performance. Such architecture permits the processor to manage a variety of processes simultaneously or a number of cores to address a single process if it needs additional computing power in order to be completed. Of course, other elements such as the amount of RAM or the connection that a given web server uses could also affect the performance of the Internet sites hosted on it.