Image to bufferedImage takes several minutes

Hi,
In my program I try to convert java.awt.Image to java.awt.image.BufferedImage:
public static BufferedImage image2BufferedImage(Image img,int w,int h){
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = bi.createGraphics();
g2d.drawImage(img, 0,0,w, h, null);
g2d.dispose();
return bi;
When the image is large, g2d.drawImage(...) takes several minutes. Someone can say me what's happen?

How i can do it?
maybe (java -Xmx125M ...)I use: java -Xmx300M
Did it work?

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