All arithmetical and logical procedures inside a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware element is usually called the "brains" of the PC too. The pace at which the CPU runs system instructions is usually referred to as its speed and it is measured in Hertz. The swifter the processing unit is, the faster scripts and web applications will be executed, even though the efficiency of the latter depends upon other things also - the read/write speed of the hard drive, the amount of physical memory, the network connection, and so forth. All current CPUs have several cores, which work together. Subsequently, the effectiveness and the workload a CPU can take care of increase, due to the fact that each core can process a number of tasks separately and numerous cores can handle a single task which cannot be processed by one core.