docs: public static void profile( Performer performer , int num ) {
  
          long deltaTime = measureTime(performer,num);
  
          System.out.printf("%30s time = %8d ms per frame = %8.3f\n",
                  performer.getName(),deltaTime,(deltaTime/(double)num));
  //        System.out.println(performer.getClass().getSimpleName()+
  //                " time = "+deltaTime+"  ms per frame "+(deltaTime/(double)num));
      }