All arithmetical and logical operations inside a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware component is typically called the "brains" of the PC as well. The pace at which the CPU executes system instructions is usually referred to as its speed which is measured in Hertz. The quicker the processing unit is, the faster scripts and web programs shall be executed, although the overall performance of the latter is dependent upon other things also - the read/write speed of the hard disk, the amount of physical memory, the network connectivity, and so on. All newer CPUs have numerous cores, which work together. Because of this, the effectiveness and the workload which a CPU can tackle increase, due to the fact that each core can process a number of tasks independently and a number of cores can handle 1 task which can't be processed by one core.