IntelliJ IDEA and Play Framework are very slow

Question

I am using IDEA 15 for Play! 2, but I'm having trouble getting the compiler stuck. Usually, when I change a file and save it per second, I can check. But often he gets stuck.

There are no warnings or messages, but a page refresh is just waiting. And the sample is one Scala template that took 43 seconds to compile, and often the only way to return to it is to restart the debugging session, but it takes a few minutes, as I sometimes run the “activator clean” and have to reload all my test data.

Is there a place somewhere maybe I missed?