CPU, or Central Processing Unit, is that part of a computer or a server which runs all of the calculations. Every CPU operates at a particular speed and the larger it is, the sooner everything shall be processed, so when you host resource-demanding web programs on a web server, for instance, a quick processor shall enable them to be performed much faster, which will drastically contribute to the overall user experience. The modern generations of CPUs have 2 and more cores, each of them running at a particular speed to guarantee a much better and faster performance. This type of architecture allows the processor to control numerous processes at one time or several cores to address a single process if it requires additional computing power to be carried out. Of course, additional factors such as the amount of RAM or the connection that a given server uses could also affect the performance of the sites hosted on it.