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Facebook Photos Now Load Faster Due To Progressive JPEG Adoption


iPhoneForums.net News Team
Jun 15, 2010
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Bay Area, CA
If you've recently noticed Facebook photos loading up faster on your iPhone and iPad, that's because Facebook recently adopted the Progressive JPEG image format.

Progressive JPEG, or PJPEG, is a format which stores several copies of a photo with different levels of image quality. Meaning that as Facebook is loading a photo, the lowest quality scan will appear first, then slowly load with more and more quality, similar to buffering a YouTube video.

Facebook listed the following reasons for switching to PJPEG:
  • Data consumption: PJPEG allows us to skip downloading smaller versions of an image.
  • Network connections: Since we don't download smaller versions of an image anymore, we now use only one connection per image instead of many.
  • Disk storage: Storing fewer photos on disk decreases the amount of disk space used by the app.
  • One URL: Since we no longer need to download multiple images at different sizes, we can simply use one URL.
Photos for all Facebook users should now be loading up around 15% the before. The Facebook app can be found in the App Store for free.