All arithmetical and logical procedures in a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware element is oftentimes called the "brains" of the PC as well. The pace at which the CPU executes system instructions is generally referred to as its speed which is measured in Hertz. The faster the processing unit is, the speedier scripts and web applications will be executed, though the overall performance of the latter depends upon other things too - the read/write speed of the hard drive, the amount of physical memory, the network connectivity, and so on. All new CPUs have multiple cores, which work together. For that reason, the overall performance and the workload that a CPU can take care of increase, due to the fact that each and every core can process different tasks separately and numerous cores can handle 1 task that cannot be processed by 1 core.