Check 8 / 12 LOW impact In the full checklist
Cloudflare + image CDN with WebP / AVIF auto
What this check is
Serving modern formats at the right size per device is the biggest image win available, and a CDN does it without touching the theme for every image.
How to implement it
Put the store behind an image CDN or a proxy that negotiates WebP or AVIF, verify the cache headers on the image responses, and make sure the originals you upload are large enough to generate the variants. Check the CDN does not break the product media URLs the theme relies on.
How to verify it
Request a product image with an AVIF or WebP accept header and confirm the format served, the cache header and the file size, and compare against the original JPEG.
All 197 checks, one Google Sheet
This page is the summary. The full checklist carries the priority, the impact score and the tool link for every check — all 197 of them, across 14 categories, as a Google Sheet and CSV with lifetime updates.
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