• Updated from 1.14.1 (this mornings GIT release) to 1.14.2 current release
• Tested on Vanilla minecraft 1.14.2
• Tested on clean spigot 1.14.2 install

Recently after many days of observations I discovered - and now I'm 100% positive about it - that one of major impacts of server-side performance is also AI of pillagers and patrols. My server keeps stable 20 TPS but when I meet a patrol TPS starts to drop and after wiping out the patrol it is raising again back to 20. I think this is something very critical that devs should look into.

Can also confirm that this happens for me in 1.14.2. Not just villagers but all entities are choppy and the TPS is around 3-4. The weird part is that I can still interact with the world and run commands smoothly even though it says the TPS is 3. Had no problem in 1.14.1.
Edit: Killed all villagers and the TPS went up to 20.

Along with the static villagers I have discovered that when attacking mobs they seem to move up into the air for a couple of seconds before returning to the ground. When in this elevated state they cannot be struck. Once they are back on the ground they can be attacked again

Also the animals and mobs move jerky just like the Minecart.

Also just to clarify, this isn't an issue on vanilla 1.14.2. I'm not sure if this is an issue on earlier 1.14.1 Spigot builds as I don't have access to a world where I can easily replicate this in a previous version. 

I can confirm the same on my server. I have an iron farm in spawn chunks, and all villagers both in and out of spawn chunks are completely 'dead' most of the time. Let me know if providing any videos or anything can be helpful. 

This is a duplicate of SPIGOT-4991. The Behavior system gets stuck on locating a POI and just makes the Villager not move. With enough Villagers loaded (10+) the TPS tanks. I got it down to 3tps with just 25 Villagers.

Vanilla is not affected.
CraftBukkit and Spigot are affected.

Wandering Villagers are also not affected (they use the PathfinderGoal system instead of Behaviors).