CPU, or Central Processing Unit, is that part of a PC or a server which carries out all the calculations. Every CPU runs at a specific speed and the larger it is, the swifter everything will be processed, so in case you host resource-demanding web applications on a web server, for example, a fast processor shall enable them to be executed much faster, which will significantly contribute to the overall user experience. The current generations of CPUs have 2 and more cores, each operating at a particular speed to guarantee a better and swifter performance. This type of architecture enables the processor to handle numerous processes simultaneously or a number of cores to address one process if it needs additional computing power in order to be completed. Naturally, additional factors such as the amount of RAM or the connection that a certain server uses may also affect the overall performance of the Internet sites hosted on it.