Yes, now Android Emulators (Intel) are too fast, but with a little drawback: I can't write on DirDefaultExternal (al least!).
I did not need to add permissions in the Manifest file; however, I have tried to add:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
I tried this HAXM fix some time back . while it did help making the Emulators slightly faster , they were still much slower
that the likes of GenyMotion (favorite) and BlueStacks.