master.cz website review

70 files are served with short cache lifetimes, so returning visitors download them again (1.3 MB).

Google Tag Manager costs a phone 1.2 s of main-thread work and 835 KiB of downloads while your page loads. That alone is enough to make taps feel slow. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

A phone's processor spends 5.5 s on main-thread work while loading, 2.4 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

7 third-party services load with your homepage (Google Tag Manager, cloudflare.com and elementor.com and others), adding 1.1 MB and 1.4 s of main-thread time.

Your mobile performance score is 58 (desktop: 64). Pages that score under 90 lose visitors before the first paint.

3 files block the first paint until they finish downloading. Deferring or inlining them could save about 800 ms.

1 image could be 771 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

About 555 KiB of JavaScript is downloaded but never used on this page.

13 long tasks block the main thread while loading, the longest for 393 ms. During a long task the page ignores taps.

The page has 2,512 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

About 36 KiB of CSS is downloaded but never applied on this page.

Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.

Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.

The page becomes fully interactive after 33.7 s. Good is under 3.8 s.

Visually, the page fills in at 10.7 s (Speed Index). Good is under 3.4 s.

Your largest element takes 4.2 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “Jediný IT poskytovatel, kterého potřebujete Přebíráme odpov…”.

Scripts block taps and scrolling for 688 ms in total while the page loads. Good is under 200 ms.

Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' largest content (lcp) went from 1.0 s to 1.2 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

The first text or image appears after 1.9 s on a phone. Good is under 1.8 s.

Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' tap response (inp) went from 121 ms to 117 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 5.8 MB in 120 requests on a phone: other files 1.8 MB (32), scripts 1.7 MB (63) and images 1.3 MB (11). Under 2 MB keeps phones on slow connections fast.

By the Sustainable Web Design model, a visit to your homepage emits about 1.63 g of CO₂e: 196.0 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

13 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.

All page content should be contained by landmarks: 31 elements on the page fail this check, rated moderate by axe-core.

Contentinfo landmark should not be contained in another landmark: 2 elements on the page fail this check, rated moderate by axe-core.

Landmarks should have a unique role or role/label/title (i.e. accessible name) combination: 2 elements on the page fail this check, rated moderate by axe-core.

Banner landmark should not be contained in another landmark: 1 element on the page fails this check, rated moderate by axe-core.

Document should not have more than one banner landmark: 1 element on the page fails this check, rated moderate by axe-core.

Document should not have more than one contentinfo landmark: 1 element on the page fails this check, rated moderate by axe-core.

22 form fields have no label, so screen readers announce an empty box and autofill guesses.

20 visible links have no text or label, so screen readers cannot say where they go.

Headings skip levels (h1 → h4, h2 → h4 and h2 → h4), which makes the page harder to scan with a screen reader.

1 link has no real href, so search engines can't follow it.

The homepage links to 133 pages on master.cz and 9 external pages.

Your homepage links to /ceph, which answers with an error. Visitors hit a dead end and search engines drop it.

/dedikovane-servery, /cloud-hosting, /virtualni-servery-vps, /managed-servery, /server-housing and /clusterova-reseni have no <h1> headline, so visitors and search engines get no clear main topic.

We fetched 15 pages linked from your homepage (of 67 found) and read each the way a search engine does.

1 error was logged to the browser console while the page loaded, for example “%c%d font-size:0;color:transparent NaN”.

No Content-Security-Policy header, the main browser-side defence against injected scripts.

On a phone, there is no call to action on the first screen: visitors have to scroll to find out what to do next.

We found no call-to-action buttons or links (such as “Book a demo” or “Get a quote”) anywhere on the homepage.

No analytics or tag manager detected in the HTML, so you can't measure whether any of these fixes work.

Your longest form asks for 15 fields (2 required). Every extra field lowers completion.

The homepage has only about 229 words of visible text; thin pages give Google and first-time buyers little to go on.

No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

Email authentication: SPF record 25 points, plus 15 when it ends in -all (10 for ~all); DMARC record 25, plus 25 for a reject policy (15 for quarantine); a DKIM key on a common selector 10.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics and Google Tag Manager (measured from a US location before any click). No consent tool was detected. Visitors from the EU, UK and several US states must be asked first.

Opening the homepage sets 1 cookie (measured from a US location before any click).

No known cookie consent tool loads with the page. Some sites build their own banner, and some only show one to visitors from the EU.

Loading the homepage contacts 9 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.