60 Performance and Optimization Tips for your Website - Reduce the size...
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7. Reduce the size of images by reducing its dimensions. Cropping images, also known as relevance-enhancing, can reduce size and also help focus the attention of the quick eye of the web surfer.
8. Use the jpg format for photos. Jpeg compression is known for its exceptional compression abilities with regard to photos. Many tools, such as ACDSee (http://www.acdsee.com/) can easily convert images from one format to another and allow you to set the compression level for jpeg images.
9. Reduce the total number of images on one page. Most web browsers download up to 4 images concurrently; however, each connection adds to the overall response/load time.
10. Reuse images whenever possible to take advantage of server-side (web server) and client-side (browser) caching.
11. Specify image WIDTH and HEIGHT attributes for faster loading in the browser.
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