Assemblers and Furnaces show the maximum production rate of the currently selected recipe in their GUI.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Furnaces, assembling machines, production chains.
See this image https://ludwig-software.de/uploads/factorio/times.png
The recipe takes 0.5 seconds to produce one item. But your display says 1/s can be produced. It should say 2/s can be produced. Bug?!
0.5/second items take 1 second to produce with level 1 machine