Question

Why is fetch time of data or an instruction a key element in processing speed?

Answer 1

Answer)

-> Each instruction is completed by following stages of operation with different clock cycles.

1) Fetch Stage--In This stage next instruction is fetched from memory and loaded in instruction register after  this stage CPU point to next instruction.

2) Decode stage--In this stage fetched encoded fetched instruction is interpreted by decoder.

3)Execute Stage-- This is last stage to execute the action required by decoded instruction in previous stage.

-> Why Fetch stage is most important in processing speed

As the First and for most stage of any instruction is Fetch stage and the main role of this stage is to fetch instruction from memory and keep readily available in instruction register in advance for further stages.

-> Therefore the fetch stage is deciding factor in processing speed