Unity 5.2 Unet laggy after updating form 5.1x

Hello,
I just have updatet my gameproject to Unity 5.2 (from 5.1x)

Now I have a extrem lags (no lags in the old Unity 5.1).

The game uses the Standart Networkmanager + Matchmaking service.

Have someone else trouble with this?

edit:

I have tested the game by connectiong over lan with the same result.