CPU, or Central Processing Unit, is that part of a computer system or a hosting server that executes all the calculations. Each and every CPU runs at a particular speed and the higher it is, the swifter everything will be processed, so if you host resource-demanding web apps on a server, for example, a fast processor will enable them to be performed faster, which will tremendously contribute to the entire user experience. The more recent generations of CPUs have 2 and more cores, each one working at a particular speed to guarantee a better and quicker performance. This sort of architecture permits the processor to manage various processes simultaneously or a number of cores to handle one process if it needs additional computing power in order to be performed. Of course, other elements like the amount of RAM or the connection a certain hosting server uses may also affect the performance of the web sites hosted on it.