Frame Rate Drops in 16.2 when farming fenced animals

HW: Google Pixel C w/ 3GB RAM, 64 GB SSD
World: -1143473476 ( 3 villages, 2 in snow, infinite )

Fenced in 2 sheep, breed them to 6 sheep, killed 4 sheep, game frame rate slows, breed two more sheep, frame rate keeps dropping, breed 2 more, kill two and frame rates drops so bad that game is unplayable. Appears to only happen when I farm animals (sheep, rabbits, pigs, cows), not plants.