All arithmetical and logical operations within a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware component is oftentimes called the "brains" of the computer system too. The pace at which the CPU carries out system instructions is usually referred to as its speed and it is measured in Hertz. The swifter the processing unit is, the more quickly scripts and web programs will be executed, even though the overall performance of the latter is dependent upon other things too - the read/write speed of the hard disk drive, the amount of physical memory, the network connectivity, and so forth. All current CPUs have a number of cores, that work together. As a result, the effectiveness and the workload which a CPU can handle increase, since each and every core can process several tasks separately and a number of cores can handle one task which cannot be processed by 1 core.