All arithmetical and logical procedures within a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware element is oftentimes called the "brains" of the PC also. The rate at which the CPU carries out system instructions is usually referred to as its speed and it is measured in Hertz. The faster the processing unit is, the quicker scripts and web apps will be executed, even though the overall performance of the latter is dependent upon other things also - the read/write speed of the hard disk drive, the amount of physical memory, the network connectivity, and many others. All newer CPUs have numerous cores, that work together. As a result, the overall performance and the workload which a CPU can handle increase, since every core can process several tasks individually and numerous cores can handle 1 task that can't be processed by one core.