Steps to reproduce:
1. Build sample bellow
2. Run sample on Raspberry Pi
3. Fast scrolling down and up and fast repeat.
4. Label is blurry and sample application is unresponsive (scrolling none)

Sample:

package labeldemojavafx;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class LabelDemoJavaFX extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        ScrollPane sp = new ScrollPane();
        sp.setVbarPolicy(ScrollPane.ScrollBarPolicy.ALWAYS);
        sp.setVmax(50);
        
        Label lbl = new Label();
        lbl.setText("Application");
        lbl.setGraphic(new ImageView(new Image(LabelDemoJavaFX.class.getResource("/Metro-icon.png").toExternalForm())));
        lbl.setGraphicTextGap(0);
        System.out.println("GraphicTextGap: " + lbl.getGraphicTextGap());
        lbl.setContentDisplay(ContentDisplay.TOP);
        
        sp.setContent(lbl);
        
        StackPane root = new StackPane();
        root.getChildren().add(sp);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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