I am trying to debug over network in Android Studio. I connected via port 5555 and generally it is possible step through break points. But it often takes minutes just to exe
Had the same problem.
There is a bug in Android Studio, see https://code.google.com/p/android/issues/detail?id=93730
They recommend removing in build.gradle (app), this fixed the issue for me.
android { buildTypes { debug { ... testCoverageEnabled true } } }