CPU, or Central Processing Unit, is that component of a computer or a web server that runs all the calculations. Each CPU operates at a certain speed and the bigger it is, the sooner everything shall be processed, so in case you host resource-demanding web apps on a server, for instance, a quick processor will allow them to be performed more quickly, which will tremendously contribute to the whole user experience. The newer generations of CPUs have 2 and more cores, each working at a particular speed to guarantee a much better and faster performance. This type of architecture allows the processor to control various processes concurrently or a number of cores to handle a single process if it needs more computing power to be completed. However, other elements like the amount of RAM or the connection a particular server uses can also affect the performance of the sites hosted on it.