All arithmetical and logical procedures inside a computer/server configuration are handled 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 completes system instructions is also 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 efficiency of the latter depends on other things as well - the read/write speed of the hard disk drive, the amount of physical memory, the network connection, and many others. All newer CPUs have several cores, which work together. For that reason, the effectiveness and the workload a CPU can manage increase, as every core can process several tasks independently and several cores can handle 1 task that cannot be processed by 1 core.