13 Feb 12
17 May 13 5:58 pm
As noted above, the file size of your images has a big impact on page load speed. I recommend JPEG compression to as small a file size as image quality will allow. I try for a max image file size of 20 KB to 50 KB (30 KB or less if at all possible).
As a Visual Communication expert and Photoshop master, the "Save for Web..." jpg compression in Adobe Photoshop is the best compression I've seen.
Sometimes using a GIF image file format and lowering the color palette to the fewest colors possible will beat JPEG compression though. In the PNG file format, I find it more difficult to reach small file sizes.
I also recommend using the "Pingdom" page load speed test to see the affect of image file size for each of your page's images. http://tools.pingdom.com/fpt/
Be sure to set the Pingdom server city for your tests with the "Settings" link.
Hope this helps...