I do not fully know what infrastructure does, but if it already does this then I did not know that!
Infrastructure should affect the performance, or the production of the building, so a building with a 90% infrastructure would produce 90% of its max potential (including the fact that there might be a certain amount of workers on duty, so those workers would be only able to produce 90% of their potential.)
Trade2 (Draconian)
newstart (United Earth)