studia-online.pl

Readiness by lane

Green: studia-online.pl. Thin bar: Education & Online Learning peer median.

Priority fixes for studia-online.pl

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

1. Priority 1 · Accelerate

   HTTP/2 negotiated

   Observed: The TLS handshake selected http/1.1 instead of HTTP/2.

   Why it matters: HTTP/2 sends many files over one connection, which speeds up pages with lots of images, styles and scripts.

   What to do: Enable HTTP/2 on your CDN or server. Most CDNs do this by default.

   80% of Education & Online Learning peers do this. Limit: Certificate and protocol were observed from one vantage point; CDNs can present different certificates by region.

   Guide: CDN Guide for Website Owners

2. Priority 2 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   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.

   34% of Education & Online Learning peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

3. Priority 3 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 11 external scripts 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.

   42% of Education & Online Learning peers do this.

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

4. Priority 4 · Accelerate

   Offscreen images lazy-loaded

   Observed: The homepage had 155 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

What studia-online.pl already does well

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

• Modern image formats in useWebP or AVIF images detected.32% of peers
• DMARC policy enforces quarantine or rejectDMARC policy p=quarantine.36% of peers
• Structured data presentJSON-LD structured data found.41% of peers

What we saw

Homepage checked

https://studia-online.pl/

Homepage response

HTTP 200

TLS

TLSv1.3, http/1.1

Certificate

Let's Encrypt, 89-day validity, expiring 2026-11-24

DNS operators

OVHcloud DNS

DMARC policy

p=quarantine

Homepage HTML

159 KB, gzip

Images on homepage

155 (svg 117, png 20, webp 18, jpg 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

Compare with other Education & Online Learning sites

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• tcsion.com62
• thaidriveexam.com62

Education & Online Learning readiness benchmark