Image cache 4K UHD photo, 7.8 MB
Via Fastly CDN
Served from:
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TTFB
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Total
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Rate
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Bytes
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Cache
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Edge
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Shield
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Direct to origin
Served from:
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TTFB
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Total
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Rate
-
Bytes
-
Cache
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Edge
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Shield
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Age
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Image Optimizer
| Variant | Bytes | Saved | Total | Cache |
|---|---|---|---|---|
| PNG 3840px | - | - | - | - |
| WebP 1920px | - | - | - | - |
| AVIF 3840px | - | - | - | - |
| WebP 800px | - | - | - | - |
Same picture, a fraction of the bytes
Both images below are served to the viewer. Look at them, then read the sizes.
Original, straight from the origin
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Format
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Dimensions
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Through Fastly Image Optimizer
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Format
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Dimensions
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What the development team had to do: nothing
No build step, no export pipeline, no second copy of every asset to keep in sync. The origin stores one high-resolution file; Fastly derives the format and size each viewer needs, at the edge, on request.
Press Load both to fetch the two versions.
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