I've noticed this too, Sony Xperia android. It always lagged a little bit but now my screen often dims while it's still loading which is 30 seconds. Not minutes for me either but noticeably longer than it was. It happened in war and then the whole screen froze and I force quit, that might be the other crashing bug, but nearly every time my phone crashes (only once every couple of days or so) it starts lagging before it crashes.