Massive amounts of villagers breeding causing game to lag substantially.

Villagers breed at a very fast rate, they can quadruple in population in just 20 minutes. There's a certain area where they like to breed, they all gather up and "rave" in a huge group. Walking by or flying by the area causes the game to get very very lagy. It can crash if the player moves too quickly. The lag was so severe that some blocks like TNT and lava buckets where not responsive. I had to get rid of all of them by throwing a bunch of "Potion of Harming" above them all, since TNT nor lava buckets where working. Once I got rid of them, the game ran fine. I was scared to let the group of villagers increase, since the world might of corrupt and become to be too lagy to play in.