disable physic debug render system and show fps

core/src/main/java/io/github/com/quillraven/GdxGame.java

@@ -81,7 +81,9 @@ public class GdxGame extends Game {
 
         super.render();
 
-        Gdx.graphics.setTitle("Mystic Tutorial - Draw Calls: " + glProfiler.getDrawCalls());
+        Gdx.graphics.setTitle("Mystic Tutorial " +
+            "- Draw Calls: " + glProfiler.getDrawCalls() + " " +
+            "- FPS: " + Gdx.graphics.getFramesPerSecond());
     }
 
     @Override

core/src/main/java/io/github/com/quillraven/system/PhysicDebugRenderSystem.java

@@ -15,6 +15,7 @@ public class PhysicDebugRenderSystem extends EntitySystem implements Disposable
         this.box2DDebugRenderer = new Box2DDebugRenderer();
         this.physicWorld = physicWorld;
         this.camera = camera;
+        setProcessing(false);
     }
 
     @Override