JFrame low performance

Question

JOptionPane.ShowInputDialog takes inputs slowly. There is a half a second gap between the user key action to reflect to text box.

Also the application (.jar file) takes more memory, approx. 75mb (Application uses JNA Windows low level Keyhook events).

How can I optimize!

Robot robot = new Robot();
BufferedImage bi=robot.createScreenCapture(new Rectangle(0,25,1366,744));
JFrame frame = new JFrame();
frame.toFront();
frame.requestFocus();
frame.setAlwaysOnTop(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String name = JOptionPane.showInputDialog(frame, "Enter file name");
frame.dispose();
String fileName= dovalidateFile(name);
FileNameExtensionFilter filter = new FileNameExtensionFilter("PNG", ".png");
fileChooser.setFileFilter(filter);
fileChooser.setSelectedFile(new File (fileName));
int returnVal = fileChooser.showSaveDialog(null);
if ( returnVal == JFileChooser.APPROVE_OPTION )
{
    File file = fileChooser.getSelectedFile();
    file = validateFile(file);
    System.out.println(file);
    ImageIO.write(bi, "png", file);
}

Answer 1

new Thread(){
    public void run(){
        Robot robot = new Robot();
        BufferedImage bi=robot.createScreenCapture(new Rectangle(0,25,1366,744));
        JFrame frame = new JFrame();
        frame.toFront();
        frame.requestFocus();
        frame.setAlwaysOnTop(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        String name = JOptionPane.showInputDialog(frame, "Enter file name");
        frame.dispose();
        String fileName= dovalidateFile(name);
        FileNameExtensionFilter filter = new FileNameExtensionFilter("PNG", ".png");
        fileChooser.setFileFilter(filter);
        fileChooser.setSelectedFile(new File (fileName));
        int returnVal = fileChooser.showSaveDialog(null);
        if ( returnVal == JFileChooser.APPROVE_OPTION )
        {
            File file = fileChooser.getSelectedFile();
            final File validatedFile = validateFile(file);
            System.out.println(file);
            try{
                ImageIO.write(bi, "png", validatedFile);
            }catch(Excepion e){
                e.printStackTrace();
            }

        }
    }
}.start();