CPU, or Central Processing Unit, is that component of a computer or a web server that executes the calculations. Every CPU functions at a certain speed and the larger it is, the quicker everything will be processed, so in case you host resource-demanding web apps on a server, for example, a quick processor shall enable them to be executed faster, which will considerably contribute to the overall user experience. The more recent generations of CPUs have two and more cores, each one functioning at a certain speed to guarantee a better and swifter performance. This kind of architecture makes it possible for the processor to manage different processes all at once or several cores to control one process if it needs additional computing power in order to be executed. Naturally, other factors like the amount of RAM or the connection which a specific server uses may also affect the efficiency of the web sites hosted on it.