eiken.or.jp

Readiness by lane

Green: eiken.or.jp. Thin bar: Education & Online Learning peer median.

Priority fixes for eiken.or.jp

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

1. Priority 1 · Accelerate

   HTML compressed

   Observed: The homepage HTML (103 KB) was delivered without gzip, Brotli or zstd compression.

   Why it matters: Compression usually shrinks HTML several times over, so the first bytes of the page arrive sooner on slow connections.

   What to do: Enable Brotli or gzip for text responses (HTML, CSS, JavaScript, JSON, SVG) at the CDN or origin.

   90% of Education & Online Learning peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: How to Set a Website Performance Budget That Teams Can Keep

2. Priority 2 · Accelerate

   Static files cached for 30 days or more

   Observed: A same-site stylesheet or script was cacheable for no max-age, short of the 30-day benchmark.

   What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.

   45% of Education & Online Learning peers do this.

   Guide: Browser Caching Guide for Website Owners

3. Priority 3 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for eiken.or.jp was p=none, which asks receivers to take no action on failing mail.

   What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.

   36% of Education & Online Learning peers do this.

   Guide: A Practical Website Health Check for Owners

4. Priority 4 · Accelerate

   Modern image formats in use

   Observed: The homepage had 57 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.

   32% of Education & Online Learning peers do this.

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

What eiken.or.jp already does well

Practices fewer than half of Education & Online Learning peers use.

• Nameservers spread across providersNameservers spread across more than one operator.13% of peers
• HSTS kept for at least a yearHSTS with a 365-day max-age.34% of peers
• Reachable over IPv6IPv6 address published.39% of peers

What we saw

Homepage checked

https://www.eiken.or.jp/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

GlobalSign, 396-day validity, expiring 2027-03-28

CDN or edge

Azure Front Door/CDN

DNS operators

3 self-run or other nameserver domains

HSTS

max-age 365 days

DMARC policy

p=none

Homepage HTML

103 KB, uncompressed

Images on homepage

57 (png 49, jpg 16)

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

Compare with other Education & Online Learning sites

• alloschool.com50
• aparsclassroom.com50
• nll.red50
• padasalai.net50
• xtramath.org51

Education & Online Learning readiness benchmark