PipedReader/Writer が遅いのか notify が遅いのか調べたけど PipedReader/Writer が遅かった

PipeTestApp.java

package dentaku.gui;

import javax.swing.*;
import java.awt.*;
import java.io.IOError;
import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;

public class PipeTestApp {
    public static void main(String[] args) throws IOException {
        notifyTest();
    }

    private static void PipeTest() throws IOException {
        JFrame frame = new JFrame();
        frame.setSize(200, 200);
        Container pane = frame.getContentPane();

        PipedWriter writer = new PipedWriter();
        PipedReader reader = new PipedReader(writer);

        JButton btn = new JButton();
        btn.setText("ボタン");
        btn.addActionListener(e -> {
            try {
                writer.write('a');
            } catch (IOException ex) {
                throw new IOError(ex);
            }
        });
        pane.add(btn, BorderLayout.NORTH);

        JLabel label = new JLabel();
        label.setText("a");
        pane.add(label, BorderLayout.CENTER);

        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);

        new Thread(() -> {
            try {
                while(true) {
                    int c = reader.read();
                    if (c < 0) return;
                    label.setText(label.getText() + (char)c);
                }
            } catch (IOException e) {
                throw new IOError(e);
            }
        }).start();
    }

    private static void notifyTest() {
        JFrame frame = new JFrame();
        frame.setSize(200, 200);
        Container pane = frame.getContentPane();

        Object lock = new Object();

        JButton btn = new JButton();
        btn.setText("ボタン");
        btn.addActionListener(e -> {
            synchronized (lock){
            lock.notifyAll();
            }
        });
        pane.add(btn, BorderLayout.NORTH);

        JLabel label = new JLabel();
        label.setText("a");
        pane.add(label, BorderLayout.CENTER);

        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);

        new Thread(() -> {
            int count = 0;
            while(true) {
                synchronized (lock) {
                    try {
                        lock.wait();
                    }catch(Throwable e){return;}
                    count++;
                    label.setText(Integer.toString(count));
                }
            }
        }).start();
    }
}