CPU, or Central Processing Unit, is that component of a personal computer or a web server which runs all of the calculations. Every single CPU runs at a certain speed and the larger it is, the sooner everything shall be processed, so when you host resource-demanding web applications on a web server, for example, a fast processor shall allow them to be performed faster, which will drastically contribute to the overall user experience. The new generations of CPUs have two and more cores, each of them operating at a specific speed to ensure a much better and quicker performance. This type of architecture enables the processor to handle numerous processes concurrently or several cores to address a single process if it requires additional computing power to be performed. Needless to say, other variables such as the amount of RAM or the connection that a certain web server uses could also affect the overall performance of the web sites hosted on it.