Suddenly everything got slow on the wp multisite. The load

Suddenly everything got slow on the wp multisite. The load times are very long in the dashboard. Hummingbird tells me that it´s the server response time.

I installed P3 plugin performance profiler, and 50% of the load time is pro sites. (5.6 sec) ultimate branding (1.7 sec) plugin time (38 sec)

I´ve granted access to the dashboard.