Production time is all about location, location, location.
However half of the time I find out that the placement of my building are a bit off or are blocked by scenery ornaments (bushes) which cause production time for certain goods from buildings to increase by an x-amount of seconds. Especially in some areas of the maps where space is limited and you would like to get the best efficiency from the resources available it's hard to judge how much space there actually is available.
Therefor I would like to make the following suggestion:
Add a transparent square Grid-Overlay to the game which highlighting squares that contain potential usable building ground.
Basically I just want to be able to see what space(squares) I can use, see here an example build with roads what I have in mind.
Let me know what you think.