All arithmetical and logical operations within a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware component is typically called the "brains" of the computer system also. The pace at which the CPU runs system instructions is typically referred to as its speed and it's measured in Hertz. The swifter the processing unit is, the speedier scripts and web programs shall be executed, even though the general performance of the latter depends upon other things as well - the read/write speed of the hard disk drive, the amount of physical memory, the network connection, and so on. All current CPUs have multiple cores, which work together. For that reason, the efficiency and the workload which a CPU can handle increase, as each and every core can process various tasks separately and several cores can handle a single task that cannot be processed by 1 core.