prtimes.jp

Readiness by lane

Green: prtimes.jp. Thin bar: SEO & Email Marketing peer median.

Priority fixes for prtimes.jp

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

1. Priority 1 · Accelerate

   Modern image formats in use

   Observed: The homepage had 51 images and none used WebP or AVIF.

   Why it matters: WebP and AVIF are typically much smaller than JPEG or PNG at similar quality, and images are often the heaviest part of a page.

   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.

   41% of SEO & Email Marketing peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

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

2. Priority 2 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for prtimes.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.

   37% of SEO & Email Marketing peers do this.

   Guide: A Practical Website Health Check for Owners

3. Priority 3 · Harden

   Certificate lifetime of 100 days or less

   Observed: The certificate from GlobalSign nv-sa had a 198-day validity period, longer than the 100-day maximum that applies from March 2027.

   What to do: Move to automated issuance and renewal now, while you still have time to test it.

   85% of SEO & Email Marketing peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

4. Priority 4 · Harden

   Content Security Policy present

   Observed: The homepage response did not include a Content-Security-Policy header.

   What to do: Start with Content-Security-Policy-Report-Only to see what would break, tighten the policy over a few weeks, then enforce it.

   27% of SEO & Email Marketing peers do this.

   Guide: Payment Security and PCI DSS: What Website Owners Need to Know

What prtimes.jp already does well

Practices fewer than half of SEO & Email Marketing peers use.

• HSTS kept for at least a yearHSTS with a 365-day max-age.36% of peers
• HTTP/3 advertisedHTTP/3 advertised.41% of peers
• Framing restrictedFraming controls present.48% of peers

What we saw

Homepage checked

https://prtimes.jp/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

GlobalSign, 198-day validity, expiring 2027-02-10

CDN or edge

Fastly

DNS operators

Amazon Route 53

HSTS

max-age 365 days

DMARC policy

p=none

Homepage HTML

396 KB, gzip

Images on homepage

51 (jpg 25, png 22, svg 4)

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 SEO & Email Marketing sites

• atpress.ne.jp74
• mailchimp.com76
• publer.com73
• seoclerk.com76
• systeme.io71

SEO & Email Marketing readiness benchmark