JavaFX Animation - Performance Impairment

Question

I created an animation of several text nodes. It is assumed that the user should read the text as it receives it from the server. The problem is that after a few minutes (about 5), performance starts to decline. 60 to 30 frames per second and below. As a result, the text is very difficult to read.

Edit 2:

I created an example of Minimal, Complete and Verifiable:

There are 3 files in the project:

MainFxApp:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.stage.Stage;

import java.util.List;

public class MainFxApp extends Application {

    @Override
    public void start(Stage primaryStage) {

        Pane root = new Pane();
        root.setStyle("-fx-background-color: black;");

        MyAnimationTimer myAnimationTimer = new MyAnimationTimer((List<MyText>) (List<?>) root.getChildren());

        MyText newText;
        for (int i = 65; i < 85; i++) {
            newText = new MyText("" + ((char) i));
            newText.setFill(Color.GREEN);
            newText.setFont(Font.font(40));
            myAnimationTimer.addNode(newText);
        }

        Scene scene = new Scene(root, 1200, 600);

        primaryStage.setTitle("Performance test");
        primaryStage.setScene(scene);
        primaryStage.show();

        myAnimationTimer.start();


    }

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

MyAnimationTimer:

import javafx.animation.AnimationTimer;
import javafx.application.Platform;
import javafx.scene.CacheHint;
import javafx.scene.Node;

import java.util.List;

public class MyAnimationTimer extends AnimationTimer {
    private List<MyText> nodes;
    private double panelWidth;
    private double panelHeight;
    private double basicVelocity; // Distance per nanosecond

    private long lastFrameTime;

    private long timeCount = 0;
    private int frameCount = 0;

    MyAnimationTimer(List<MyText> nodes) {
        super();
        this.nodes = nodes;
        this.panelWidth = 1200;
        this.panelHeight = 600;
        this.setBasicVelocity();
    }

    @Override
    public void start() {
        this.lastFrameTime = System.nanoTime();
        super.start();
    }

    @Override
    public void handle(long now) {

        long deltaT = now - lastFrameTime;
        double deltaX = this.basicVelocity * deltaT;

        for (MyText node : this.nodes) {
            node.setTranslateX(node.getTranslateX() + node.direction * deltaX);
            if (node.getTranslateX() < 0) {
                node.direction = 1;
            } else if (node.getTranslateX() > 1200) {
                node.direction = -1;
            }
        }

        this.lastFrameTime = now;

        this.timeCount += deltaT;
        this.frameCount++;

        if (timeCount > 1000000000) {
            System.out.println(this.frameCount / (double) timeCount * 1000000000);
            this.frameCount = 0;
            this.timeCount = 0;
        }
    }

    void addNode(final MyText node) {  // Not sure about the final thing
        Platform.runLater(() -> {
            node.setCache(true);
            node.setCacheHint(CacheHint.SPEED);
            node.setTranslateY(panelHeight / 2);

            double nodePositionX = panelWidth - 20;

            if (nodes.size() >= 1) {
                Node lastNode = nodes.get(nodes.size() - 1);
                double lastNodeEnd = lastNode.getTranslateX() + 50;
                if (lastNodeEnd > nodePositionX) {
                    nodePositionX = lastNodeEnd;
                }
            }

            node.setTranslateX(nodePositionX);

            nodes.add(node);
        });
    }

    private void setBasicVelocity() {
        Platform.runLater(() -> {
            this.basicVelocity = ((panelWidth / 4) * 3 / (double) 5000 / 1000000.0);
        });
    }
}

MyText:

import javafx.scene.text.Font;
import javafx.scene.text.Text;

class MyText extends Text {
    int direction = -1;

    MyText(String text) {
        super(text);
        this.setFont(new Font("Arial Regular", 40));
    }
}

Even with such a simple example, the performance drop is significant. There are 20 nodes on the scene, and fps drops below 20. My processor is the i5-4440 CPU (3.10GHz × 4). The problem occurs on every platform on which I tested it - JavaFX 8, JavaFX 9, and Ubuntu 16.04.

Edit 3:

The problem seems to be present only on the Linux platform.

Windows, JavaFX Platform.runLater, , 60 . - , ?

,

Answer 1

, Linux JavaFX. .

:

java -Dprism.order=j2d -jar myfxapp.jar