mysteryscience.com

Readiness by lane

Green: mysteryscience.com. Thin bar: Education & Online Learning peer median.

Priority fixes for mysteryscience.com

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

1. Priority 1 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 4 external scripts without async or defer.

   Why it matters: A plain <script src> in the head stops the browser from showing anything until that file has downloaded and run.

   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.

   42% of Education & Online Learning peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

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

2. Priority 2 · Accelerate

   Offscreen images lazy-loaded

   Observed: The homepage had 31 images and none used loading="lazy".

   What to do: Add loading="lazy" to images below the fold. Do not lazy-load the main hero image, because that delays the largest visible element.

   52% of Education & Online Learning peers do this.

   Guide: Lazy Loading Without Broken Pages

3. Priority 3 · Accelerate

   HTTP/3 advertised

   Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.

   What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.

   25% of Education & Online Learning peers do this.

   Guide: CDN 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.

   25% of Education & Online Learning peers do this.

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

What mysteryscience.com 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
• Referrer-Policy setReferrer-Policy present.27% of peers
• Modern image formats in useWebP or AVIF images detected.32% of peers

What we saw

Homepage checked

https://mysteryscience.com/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Let's Encrypt, 89-day validity, expiring 2026-12-12

CDN or edge

Heroku

DNS operators

DNS Made Easy, plus 4 self-run or other nameserver domains

HSTS

max-age 730 days

DMARC policy

p=quarantine

Homepage HTML

265 KB, gzip

Images on homepage

31 (png 3)

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

• imperial.ac.uk77
• infoedu.uz77
• maktabkhooneh.org77
• pw.live77
• santanderopenacademy.com77

Education & Online Learning readiness benchmark