CPU, or Central Processing Unit, is that part of a PC or a server that runs all of the calculations. Each CPU operates 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 server, for example, an effective processor shall allow them to be executed more quickly, which will considerably contribute to the overall user experience. The more recent generations of CPUs have two and more cores, each of them working at a specific speed to ensure a better and quicker performance. Such architecture permits the processor to control different processes concurrently or a number of cores to manage one process if it requires additional computing power to be executed. However, additional factors like the amount of RAM or the connection a specific web server uses could also affect the efficiency of the Internet sites hosted on it.