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Optimised images defined using srcset and parameters not used in tests
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Optimised images defined using srcset and parameters not used in tests
08-10-2020, 11:09 PM
Post: #1
Optimised images defined using srcset and parameters not used in tests
Hi there,

We use Contentful CDN to optimise images dynamically based on viewport and browser. One of the enhancements we have is WebP if the browser supports it. The enhancements are added using parameters at the end of the image URL, which is usually a JPG.

It appears that the Webpagetest waterfall view only displays information for the jpg images, even if a test browser is selected which supports webp. The image asset used by Webpagetest is the fallback (jpeg) image and it hasn't been been resized. An example test is here:
https://webpagetest.org/result/200810_PW...ff14e662c/

The optimised URL for the main product image I can see in Chrome on this page is: https://images.ctfassets.net/bz0fvtkbk5r...50&fm=webp

and the one shown in the waterfall view is: https://images.ctfassets.net/bz0fvtkbk5r...=80&w=1750

Thanks in advance for any help & advice.
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Optimised images defined using srcset and parameters not used in tests - Andy Clarke - 08-10-2020 11:09 PM

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