CPU, which is frequently called just "processor", is an abbreviation for Central Processing Unit. That's the core of any laptop or computer or hosting server, since it executes each of the calculations and logical input/output functions. Though the performance of a website or an app relies upon other things also, like the amount of physical memory or the online connectivity of the hosting server, the pace at which a certain processor operates determines how soon an app shall be executed. Later-generation processors have numerous cores that can considerably increase their overall power and efficiency, because every core can take on several processes independently or several cores can deal with 1 process that requires a substantial computing power. Because every single core functions at a certain speed, this architecture can be looked at as several independent processors working together.