postaonline.cz

Readiness by lane

Green: postaonline.cz. Thin bar: Postage & Courier Services peer median.

Priority fixes for postaonline.cz

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

1. Priority 1 · Accelerate

   HTML compressed

   Observed: The homepage HTML (26 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.

   85% of Postage & Courier Services 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

   HTTP/2 negotiated

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

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

   74% of Postage & Courier Services peers do this.

   Guide: CDN Guide for Website Owners

3. Priority 3 · Accelerate

   Modern image formats in use

   Observed: The homepage had 7 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.

   31% of Postage & Courier Services peers do this.

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

4. Priority 4 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 10 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.

   39% of Postage & Courier Services peers do this.

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

What postaonline.cz already does well

Practices fewer than half of Postage & Courier Services peers use.

• DNSSEC signedDNSSEC delegation (DS record) present.11% of peers
• CAA records limit who can issue certificatesCAA limits issuance to digicert.com.16% of peers
• Content Security Policy presentContent-Security-Policy present.31% of peers

What we saw

Homepage checked

https://www.postaonline.cz/

Homepage response

HTTP 200, after 2 redirects

TLS

TLSv1.3

Certificate

DigiCert, 198-day validity, expiring 2026-11-18

DNS operators

1 self-run or other nameserver domain

HSTS

max-age 1,095 days, includeSubDomains

DMARC policy

p=reject

Homepage HTML

26 KB, uncompressed

Images on homepage

7 (png 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 Postage & Courier Services sites

• bluedart.com61
• cttexpress.com62
• myhermes.de62
• nzpost.co.nz62
• shreemaruti.com62

Postage & Courier Services readiness benchmark