Hi,
usually each player builds some buildings always at the same lvl. For example I upgrade my copper mines always at lvl 3. Another player maybe want his mines at lvl 2, or lvl 4, always the same.
Now need build at lvl 1, and after upgrade at lvl 2, and wait and upgrade at lvl 3..... So much time wasted.
Make the possibility to build directly at lvl 3 (or what the player wants), take all the time needed (lvl 1 + lvl2 + lvl3) and the resources needed for all the levels, but so no need follow every 3 minutes the game and continue to click click click... and maybe lose one upgrade because must run out of home.
Thank you.