import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.stage.Stage;

public class FrameRateTest extends Application{

	@Override
	public void start(Stage primaryStage) throws Exception {
		long prevTime = System.nanoTime(); 
		AnimationTimer timer = new AnimationTimer() { 
			@Override 
			public void handle(long curTime) { 
				double deltaTime = (curTime - prevTime) / 1E9; 
				System.out.println(1/deltaTime); 
			} 
		}; 
		timer.start(); 

	}

	public static void main(String[] args) { 
		launch(args); 
	} 
}