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Facebook iPhone and iPad users should see photos load faster with file changes

<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even" property="content:encoded"><p><a href='http://www.imore.com/facebook-iphone-and-ipad-users-should-see-photos-load-faster-file-changes' title="Facebook iPhone and iPad users should see photos load faster with file changes"><img src='http://www.imore.com/sites/imore.com/files/styles/large_wm_brw/public/field/image/2014/10/facebook-iphone6-hero.jpg?itok=gNJ17Mo8' />[/url]</p> <p>Facebook (http://www.imore.com/facebook-iphone-ipad) has made some changes in the background to its iPhone (http://www.imore.com/iphone-6) and iPad (http://www.imore.com/ipad) app that should allow users to load photos faster. The improvements are due to Facebook adopting the Progressive JPEG (PJPEG) image format.</p> <!--break--> <p>The PJPEG format stores several scans of one photo, each with a different level of quality. This allows the image to be rendered with the first, low quality scan, and then be updated with the other scans that each have a higher level of quality. Facebook now users the PJPEG image format for several reasons:</p>

<ul><li>Data consumption: PJPEG allows us to skip downloading smaller versions of an image.</li> <li>Network connections: Since we don't download smaller versions of an image anymore, we now use only one connection per image instead of many.</li> <li>Disk storage: Storing fewer photos on disk decreases the amount of disk space used by the app.</li> <li>One URL: Since we no longer need to download multiple images at different sizes, we can simply use one URL.</li> </ul>

<p>The final result is that photos in the iOS Facebook app with the PJPEG format load 15% faster compared to its old method.</p> <p>Source: Facebook (https://code.facebook.com/posts/857662304298232/faster-photos-in-facebook-for-ios/)</p> </div></div></div><div id="comment-wrapper-nid-29660"></div><img width='1' height='1' src='http://tipb.com.feedsportal.com/c/33998/f/616881/s/42cdb73c/sc/4/mf.gif' border='0'/><br clear='all'/>

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