1. Run a simple app below.
2. Make a selection of a word or two.
3. Make a speedy scroll down and up.

A video is attached.
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import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.stage.Stage;


public class TA extends Application {
    @Override
    public void start(Stage stage) {
        TextArea textArea = new TextArea();
        textArea.setPrefColumnCount(24);
        textArea.setText("import javafx.application.Application;\n" +
                "import javafx.scene.Scene;\n" +
                "import javafx.scene.control.TextArea;\n" +
                "import javafx.stage.Stage;\n" +
                "\n" +
                "\n" +
                "public class TA extends Application {\n" +
                " @Override\n" +
                " public void start(Stage stage) {\n" +
                " TextArea textArea = new TextArea();\n" +
                " textArea.setPrefColumnCount(24);\n" +
                " textArea.setText(\"\");\n" +
                " Scene scene = new Scene(textArea);\n" +
                "\n" +
                " stage.setScene(scene);\n" +
                " stage.show();\n" +
                " }\n" +
                "\n" +
                " public static void main(String[] args) {\n" +
                " TA.launch(args);\n" +
                " }\n" +
                "}\n");
        Scene scene = new Scene(textArea);

        stage.setScene(scene);
        stage.show();
    }

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