schulferien.org

Readiness by lane

Green: schulferien.org. Thin bar: Web Tools peer median.

Priority fixes for schulferien.org

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

1. Priority 1 · Harden

   TLS 1.3 negotiated

   Observed: The TLS connection negotiated TLSv1.2.

   Why it matters: TLS 1.3 removes legacy cipher suites and completes the handshake in fewer round trips, so it is both safer and faster for new connections.

   What to do: Enable TLS 1.3 on your CDN or server. Keep TLS 1.2 available for older clients unless you have checked your audience.

   92% of Web Tools peers do this. Limit: Certificate and protocol were observed from one vantage point; CDNs can present different certificates by region.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Enable

   XML sitemap discoverable

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

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

   73% of Web Tools peers do this.

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

3. Priority 3 · 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.

   69% of Web Tools peers do this.

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

4. Priority 4 · Accelerate

   Modern image formats in use

   Observed: The homepage had 8 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.

   37% of Web Tools peers do this.

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

What schulferien.org already does well

Practices fewer than half of Web Tools peers use.

• HSTS kept for at least a yearHSTS with a 730-day max-age covering subdomains.30% of peers

What we saw

Homepage checked

https://www.schulferien.org/

Homepage response

HTTP 200

TLS

TLSv1.2, HTTP/2

Certificate

Sectigo, 198-day validity, expiring 2026-11-20

DNS operators

IONOS DNS

HSTS

max-age 730 days, includeSubDomains, preload

Homepage HTML

248 KB, gzip

Images on homepage

8 (png 5, gif 1)

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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Web Tools readiness benchmark