Building a wall (I am on ts29.travian.com) has zero population growth until lvl5. Then only 1.
This must be wrong. I am sure there must be some game calculation for this, but … think about it: when a village/town starts building a wall, then, and even before the wall is complete, people will rush inside to seek the protection - and because they afraid of being kept out? So there should be an immediate population push when the wall starts.
I suppose, someone can argue that people will wait to see if the wall is good, before deciding to move, but I say the urge to move when a wall starts being built is stronger, and it is not correct to have zero population growth until lvl5. There should be immediate population growth - at least 2 - and then maybe little or nothing until the wall is serious.