CPU, or Central Processing Unit, is that part of a home PC or a web server that carries out all of the calculations. Every single CPU runs at a specific speed and the higher it is, the sooner everything shall be processed, so in case you host resource-demanding web programs on a server, for example, a powerful processor shall enable them to be executed speedier, which will greatly contribute to the entire user experience. The newer generations of CPUs have two and more cores, each running at a particular speed to guarantee a much better and faster performance. Such architecture makes it possible for the processor to handle different processes all at once or a number of cores to manage a single process if it requires more computing power to be carried out. Of course, additional factors such as the amount of RAM or the connection a specific server uses could also affect the performance of the web sites hosted on it.