Villagers have new mechanics in 1.14 that cause them to run very CPU expensive pathfinding operations. This plugin aims to reduce their impact on a server's performance by forcing them to run these pathfinding operations less frequently, all while not stopping them from functioning as normal.

Plugin Link:

https://www.spigotmc.org/resources/villager-optimiser-1-14-2-1-16-3.68517/