Summary: Do not redefine the image width and height in HTML
When you use the IMG tag html, src attribute set a picture is 1024 * 768 pictures,
But you chose to set the image width (width) and high (height), ex: 100 * 100, then there will be a few questions:
1. Your picture still need to spend time with the same artwork
2. Your picture will be distorted because of the proportion of problem
Readers can also see the recommendation in Yahoo's Best Practices for Speeding Up Your Web Site
Original: Large columns do not redefine the image width and height in HTML