I built a large village. Approximately 96x96 blocks, about 3,000 homes (doors), relied on approximately 1,000 inhabitants. The village has two roles - store and farm iron. For normal operation of the farm needs iron residing in one place spawn zone Iron Golem, and that at some point it became a problem. Despite the fact that my second character is constantly moving in the trolley through the village - golems spawn area have moved from place to place, it seems that the village has become divided into several smaller ones.
At this point in the village of about 400-500 villagers. The villagers in the village are distributed fairly evenly using streams of water and need to see all the houses. Moreover, on the perimeter of the village are a trap for residents (pressure plate, steel door), with which the store and arranged from individual cells. In these cells residents are always on one and the same place and the same distributed uniformly along the perimeter of the village. So I think that the situation is "villagers did not see parts of houses and therefore the center of the village moves" - is excluded.

Server option view-distance=16, clients has 32

Sorry for the bad english, I use google translate