All arithmetical and logical functions within a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware component is sometimes called the "brains" of the personal computer as well. The pace at which the CPU runs system instructions is usually referred to as its speed which is measured in Hertz. The swifter the processing unit is, the quicker scripts and web programs shall be executed, even though the efficiency of the latter is determined by other things also - the read/write speed of the hard disk, the amount of physical memory, the network connection, etc. All new CPUs have numerous cores, which work together. Subsequently, the effectiveness and the workload that a CPU can handle increase, as each and every core can process a number of tasks separately and several cores can handle 1 task that cannot be processed by 1 core.