CPU, or Central Processing Unit, is that part of a computer or a web server which runs all the calculations. Each CPU runs at a certain speed and the bigger it is, the speedier everything will be processed, so in case you host resource-demanding web applications on a web server, for instance, a quick processor shall enable them to be performed speedier, which will drastically contribute to the overall user experience. The modern generations of CPUs have two and more cores, each working at a specific speed to guarantee a better and faster performance. Such architecture permits the processor to control various processes concurrently or several cores to manage one process if it needs more computing power in order to be carried out. Obviously, other variables such as the amount of RAM or the connection a given server uses can also affect the performance of the web sites hosted on it.