CPU, or Central Processing Unit, is that element of a home PC or a web server which runs all the calculations. Every CPU functions at a specific speed and the higher it is, the faster everything shall be processed, so if you host resource-demanding web applications on a web server, for example, a powerful processor will allow them to be carried out faster, which will tremendously contribute to the entire user experience. The newer generations of CPUs have two and more cores, each operating at a particular speed to guarantee a much better and quicker performance. This sort of architecture makes it possible for the processor to handle different processes all at once or several cores to address one process if it needs more computing power to be performed. Needless to say, other variables like the amount of RAM or the connection which a certain hosting server uses may also affect the efficiency of the sites hosted on it.