Zombie Pigman AI lag, freezes the game.

The game freezes when you agro high amounts of pigmen.
The redstone stuff stop working the entieties stop mving, but you can sorta move around, heavy lag.

Acording to https://twitter.com/Panda4994/status/681999441662885888 Is the AI

This does not happen in 1.8 only in the 1.9 snapshots. as you can see in both of th version I attached,

In 1.8 I get about 20 fps and the farm works, just fine. With more than 50% extra juice in my cpu and memory.

In 1.9 I get no fps the game freezes but I can move sorta, And I still have more than 50% extra juice in the memory and cpu, the game just stops.
Until you go on creative and it will slowly come back alive.