Hiya, using DA 1.50X (as far as I know) I discovered that when you open the planet/ship location submenu (first icon on left of main UI) and left click on a planetary improvement it brings up a window of the improvement currently being built. However it always returns a effect bonus of 1%. It doesn't matter whether you are building a basic factory or (in my case) the Tir Academy, they all claimed to give only a bonus to the relevant attribute of 1%. They report different build times, just an incorrect effect bonus. It gives the correct bonus information if you are actually in the main planet management window. I don't know whether this effect is limited to just the player's planets or whether it occurs with all planets.