How would I add a tooltip to specific strings on a textArea in java?

I modified the GUI to make it easier for me to test.

The TooltipManager class worked for me, but it took 2 or 3 seconds for the tooltip to display. When the mouse is moving, no tooltip displays. I'm running on Windows 10, using Java 22.

Here's the code I used. I made the TooltipManager class an inner class.

import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.HashMap;
import java.util.Map;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

public class TooltipExample implements Runnable {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new TooltipExample());
    }

    private JTextArea textArea;

    private TooltipManager tooltipManager;

    @Override
    public void run() {
        JFrame frame = new JFrame("Custom Tooltip Application");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(createTextPanel(), BorderLayout.CENTER);

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel createTextPanel() {
        JPanel panel = new JPanel(new BorderLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

        JPopupMenu popupMenu = new JPopupMenu();
        JMenuItem addTooltipItem = new JMenuItem("Add Tooltip");
        addTooltipItem.addActionListener(e -> addTooltip());
        addTooltipItem.setFont(panel.getFont().deriveFont(20f));
        popupMenu.add(addTooltipItem);

        textArea = new JTextArea(10, 30);
        textArea.setComponentPopupMenu(popupMenu);
        textArea.setFont(panel.getFont().deriveFont(20f));
        textArea.setText(createSampleText());
        textArea.setCaretPosition(0);
        textArea.setWrapStyleWord(true);
        textArea.setLineWrap(true);

        tooltipManager = new TooltipManager(textArea);

        JScrollPane scrollPane = new JScrollPane(textArea);
        panel.add(scrollPane, BorderLayout.CENTER);

        return panel;
    }

    private String createSampleText() {
        return "I would like to make it so that a user can select "
                + "text that they've previously written into a "
                + "textArea, then afterwards they would be "
                + "able to select it and add a tooltip that "
                + "would appear when hovering said text.\r\n\r\n"
                + "I tried to make it but i've only managed"
                + " to have it show the tooltip when hovering"
                + " anywhere inside of the textArea, meaning"
                + " that whenever a tooltip is created, it "
                + "will be shown if the mouse hovers inside "
                + "of the textArea, irregardless of where it "
                + "hovers, as opposed to having it only show "
                + "the tooltip when the mouse hovers the "
                + "string that it was created in.";
    }

    private void addTooltip() {
        String selectedText = textArea.getSelectedText();
//      System.out.println(selectedText);
        if (selectedText == null) {
            JOptionPane.showMessageDialog(textArea,
                    "Please select a word for the tooltip.");
        } else {
            selectedText = selectedText.trim();
            if (!selectedText.isEmpty()) {
                String tooltipText = JOptionPane.showInputDialog(textArea,
                        "Enter tooltip text for \"" + selectedText + "\":");
                tooltipManager.addTooltip(selectedText, tooltipText);
            }

        }

    }

    public class TooltipManager {

        private JTextArea textArea;

        private Map<String, String> tooltips;

        public TooltipManager(JTextArea textArea) {
            this.textArea = textArea;
            this.tooltips = new HashMap<>();
            textArea.addMouseMotionListener(new MouseMotionAdapter() {
                @Override
                public void mouseMoved(MouseEvent event) {
//                  textArea.setToolTipText("Testing");
                    updateTooltip(event);
                    
                }
            });
        }

        public void addTooltip(String text, String tooltip) {
            tooltips.put(text, tooltip);
        }

        private void updateTooltip(MouseEvent event) {
            String word = getWordAtPoint(event.getPoint());
//          System.out.println(word);
            if (word != null && tooltips.containsKey(word)) {
                String text = tooltips.get(word);
                textArea.setToolTipText(text);
//              System.out.println("Success: " + text);
            } else {
                textArea.setToolTipText(null);
            }
        }

        private String getWordAtPoint(Point p) {
            int pos = textArea.viewToModel2D(p);
            String text = textArea.getText();
            int start = findWordStart(text, pos);
            int end = findWordEnd(text, pos);
            return text.substring(start, end);
        }

        private int findWordStart(String text, int pos) {
            while (pos > 0 && Character.isLetterOrDigit(text.charAt(pos - 1))) {
                pos--;
            }
            return pos;
        }

        private int findWordEnd(String text, int pos) {
            while (pos < text.length()
                    && Character.isLetterOrDigit(text.charAt(pos))) {
                pos++;
            }
            return pos;
        }

    }

}