> For example, with one pipeline, each step taking 1 unit of time, once the pipeline is filled, will take six units of time to make a six-pack Compared to 18 u

> For example, with one pipeline, each step taking 1 unit of time, once the pipeline is filled, will take six units of time to make a six-pack Compared to 18 units of time needed to make a six-pack without pipelining. Gee, what a wondrous invention this "pipeline" is: having three workers means the work is accomplished thrice as fast, yet there is (according to you) no parallelism at all! So naturally, if we could introduce parallelism inside this single pipeline, we would be able to make another triple reduction in time, and get a production of six-pack take only 2 units of time.