Java SE (Java Platform, Standard Edition)

i am writing a program in which i am implementing documentlistener
to communicating between two frames
if i write my code with javax.swing.SwingUtilities.invokeLater it makes my program slow
and if i write without this thread safe quality then this is fast but giving me runtime exception
what i do to make my program better
kindly suggest

public void insertUpdate(DocumentEvent e) {
            updateLog(e, "inserted into");
        }
        public void removeUpdate(DocumentEvent e) {
            updateLog(e, "removed from");
        }
        public void changedUpdate(DocumentEvent e) {
            //Plain text components don't fire these events.
        }

        public void updateLog(DocumentEvent e, String action) {
            Document doc = (Document)e.getDocument();
javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
tf4.setText(lbl.getText());
            }
        });
}