CPU, or Central Processing Unit, is that element of a personal computer or a hosting server which runs each of the calculations. Each CPU functions at a specific speed and the bigger it is, the swifter everything will be processed, so when you host resource-demanding web applications on a server, for instance, a powerful processor will allow them to be performed faster, which will significantly contribute to the overall user experience. The modern generations of CPUs have 2 and more cores, each one working at a particular speed to ensure a better and speedier performance. Such architecture makes it possible for the processor to control numerous processes concurrently or several cores to address a single process if it needs additional computing power in order to be performed. Naturally, additional factors such as the amount of RAM or the connection which a certain web server uses could also affect the overall performance of the web sites hosted on it.