After the update, villages appear to be using an extreme amount of CPU on the server. I built an iron golem farm similar to TangoTek's latest Iron foundry (https://www.youtube.com/watch?v=N-Je3IpC1aY) but I only did 16 villages on either side for total of 352 doors (16x11x2). I then moved my spawn chunk to the farm using /setworldspawn. I don't know if that had any bearing on this or not. At first I tried killing my villagers to see if it was the villagers themselves, but the doors had to be destroyed to fix the CPU usage.
The latest patch caused my CPU utilization to jump from 1-2% at idle to one processor pegged at 100% on my server: http://i.imgur.com/mDnBS9D.png