Use the best compression format and image size per browser type requesting it. This is tougher to do, as the CMS or web application needs to have this dynamic capability.
If you were presented with the graphic interface of eBay’s website from 1995, 2005 and today, which website would you most likely buy from? It's a safe bet that their current site would be your preferred choice, as it appears more professional and engaging compared to previous years.
Notice how the pages have improved since 1995. Year after year, the site has improved to generate a much more pleasant user experience. But this improved UX has come with a price: increased payload. New designs include more graphics and image resources to build a better experience for the customer, but this added content increases the page payload. According to recent data from httparchive.org, images represent over 60 percent of an average web page’s payload (about 1.1 MB of images per page). The implication is that today’s web pages take longer to load, averaging 11.4 seconds. As a result, the end user may also receive a negative quality of experience.
Armed with this information, one would think that site owners who invest time, resources and money on their websites would also invest in optimizing their site images for faster download. Unfortunately, this is not the case. Data has shown that 56 percent of websites either do a poor job of optimizing images or don’t do it at all. The question to be asked is what can be done when optimizing images for websites and what should you avoid? In this slideshow, Yaron Azerual, product manager, Application Delivery for Radware, has identified a list of five dos and don’ts when it comes to image optimization.
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