Very low framerate in 1.9 Snapshots

I play with around 400-500 FPS on 1.9 Shapshots. But when I make small animal (food) farm with 150-200 Entityes the Framerate fall to 30-40.
On 1.8.8 (1.8+ Versions) WITHOUT OptiFine, with Max Graphics Settings and 200-300 Entityes i play with 200-280 FPS. I think this is from the new 1.9 snapshots performance. This has been tested on different computers in different worlds (Creative, Survival...). Sorry if this topic is repeated by another people.