Extreme Image Optimisation: WebP & JPEG XR
summary
Akamai adds server‑side support for WebP and JPEG XR and reports about 30% average file‑size savings on images compared with legacy JPEG/PNG, measured by scanning the top 100 sites and using DSSIM quality parity. Over 90% of images show large gains while roughly 5% compress better as JPEG, so fallback logic is necessary. Browser support splits: WebP covers Chrome/Opera/Android, JPEG XR covers IE10/Windows/Windows Phone, with partial overlap, and progressive rendering benefits JPEG XR though WebP currently compresses slightly better.
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chapters (6)
- 0:00Start
- 0:44Images make up 61% of Page Bytes
- 1:38Supporting a new image format is hard!
- 4:12Improvement over JPEG
- 6:07Web Site Performance
- 6:42Perceived Performance
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