sketchfab.com

Readiness by lane

Green: sketchfab.com. Thin bar: Design & Content Creation peer median.

Priority fixes for sketchfab.com

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Enable

   XML sitemap discoverable

   Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.

   Why it matters: A sitemap helps search engines find new and updated pages, especially on large or frequently updated sites.

   What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.

   84% of Design & Content Creation peers do this. Limit: Only the standard location was requested, once, at the time of the check.

   Guide: XML Sitemap Guide: Include Only URLs You Stand Behind

2. Priority 2 · Accelerate

   Modern image formats in use

   Observed: The homepage had 19 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   56% of Design & Content Creation peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

3. Priority 3 · Harden

   HSTS kept for at least a year

   Observed: Strict-Transport-Security was sent with a max-age of 7 days, below the one-year benchmark.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   On Amazon CloudFront: Attach a response headers policy with Strict-Transport-Security to each distribution.

   37% of Design & Content Creation peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

4. Priority 4 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 1 external script without async or defer.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   49% of Design & Content Creation peers do this.

   Guide: Control Third-Party Scripts Before They Control Your Page

What sketchfab.com already does well

Practices fewer than half of Design & Content Creation peers use.

• CAA records limit who can issue certificatesCAA limits issuance to amazon.com, digicert.com, letsencrypt.org.17% of peers
• DMARC policy enforces quarantine or rejectDMARC policy p=quarantine.41% of peers
• Framing restrictedFraming controls present.48% of peers

What we saw

Homepage checked

https://sketchfab.com/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Amazon, 394-day validity, expiring 2027-01-15

CDN or edge

Amazon CloudFront

DNS operators

Amazon Route 53

HSTS

max-age 7 days

DMARC policy

p=quarantine

Homepage HTML

180 KB, gzip

Images on homepage

19 (svg 13, png 6)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

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Design & Content Creation readiness benchmark