Tools & Wizards About Us
dat.cz screenshot

Report Summary

  • 63

    Performance

    Renders faster than
    77% of other websites

  • 79

    Accessibility

    Visual factors better than
    that of 47% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 89

    SEO

    Google-friendlier than
    66% of websites

dat.cz

Internet, online TV, mobilní služby | Nordic Telecom

Page Load Speed

5.3 sec in total

First Response

765 ms

Resources Loaded

3.8 sec

Page Rendered

698 ms

dat.cz screenshot

About Website

Welcome to dat.cz homepage info - get ready to check Dat best content right away, or after learning these important things about dat.cz

Bez sekání. Bez starostí. Na zelenou. Poskytujeme pevný internet nebo třeba vychytanou IPTV. Objevte všechny naše telekomunikační služby.

Visit dat.cz

Key Findings

We analyzed Dat.cz page load time and found that the first response time was 765 ms and then it took 4.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

dat.cz performance score

63

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.1 s

21/100

10%

LCP (Largest Contentful Paint)

Value6.3 s

11/100

25%

SI (Speed Index)

Value6.3 s

42/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value4.1 s

86/100

10%

Network Requests Diagram

www.nordictelecom.cz

765 ms

nordictelecom.cz

786 ms

main-d271a824c9821fc96c15.css

431 ms

api.js

34 ms

main-d271a824c9821fc96c15.bundle.js

897 ms

Our browser made a total of 54 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Dat.cz, 7% (4 requests) were made to Googletagmanager.com and 6% (3 requests) were made to Connect.facebook.net. The less responsive or slowest element that took the longest time to load (1.3 sec) relates to the external source Nordictelecom.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 325.6 kB (15%)

Content Size

2.2 MB

After Optimization

1.9 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dat.cz main page is 2.2 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 65% of websites need less resources to load. Images take 1.3 MB which makes up the majority of the site volume.

HTML Optimization

-91%

Potential reduce by 281.2 kB

  • Original 310.7 kB
  • After minification 298.5 kB
  • After compression 29.4 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 281.2 kB or 91% of the original size.

Image Optimization

-3%

Potential reduce by 33.7 kB

  • Original 1.3 MB
  • After minification 1.3 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Dat images are well optimized though.

JavaScript Optimization

-2%

Potential reduce by 10.6 kB

  • Original 464.1 kB
  • After minification 464.1 kB
  • After compression 453.5 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

CSS Optimization

-0%

Potential reduce by 0 B

  • Original 157.9 kB
  • After minification 157.9 kB
  • After compression 157.9 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Dat.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 18 (37%)

Requests Now

49

After Optimization

31

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 49 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dat. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

www.nordictelecom.cz

www.nordictelecom.cz

765 ms

nordictelecom.cz

nordictelecom.cz

786 ms

main-d271a824c9821fc96c15.css

main-d271a824c9821fc96c15.css

431 ms

api.js

api.js

34 ms

main-d271a824c9821fc96c15.bundle.js

main-d271a824c9821fc96c15.bundle.js

897 ms

recaptcha__cs.js

recaptcha__cs.js

92 ms

gtm.js

gtm.js

145 ms

logo-nordic.svg

logo-nordic.svg

187 ms

logo-nordic-short.svg

logo-nordic-short.svg

270 ms

basket.svg

basket.svg

373 ms

search.svg

search.svg

377 ms

phone.svg

phone.svg

375 ms

vracime_do_telekomunikaci_svobodu_-_nordic_telecom.jpg

vracime_do_telekomunikaci_svobodu_-_nordic_telecom.jpg

783 ms

zeleny_internet_-_nordic_telecom.jpg

zeleny_internet_-_nordic_telecom.jpg

379 ms

nordic_tv-iptv-2.jpg

nordic_tv-iptv-2.jpg

784 ms

zakaznicka_pece_nordic_telecom_1.jpg

zakaznicka_pece_nordic_telecom_1.jpg

783 ms

vsechny_internetove_tarify_za_295_kc.jpg

vsechny_internetove_tarify_za_295_kc.jpg

875 ms

ajtak_na_prijmu.jpg

ajtak_na_prijmu.jpg

556 ms

prima-comedy-2.png

prima-comedy-2.png

558 ms

viasat_history_218Y14q.png

viasat_history_218Y14q.png

782 ms

sport2-1.png

sport2-1.png

783 ms

sporty_tv.png

sporty_tv.png

890 ms

love_nature.png

love_nature.png

891 ms

iptv-na-3-msice-zdarma.jpg

iptv-na-3-msice-zdarma.jpg

996 ms

internet-speed-test.jpg

internet-speed-test.jpg

1107 ms

prima-fresh-festival-soutez-listky-2024.jpg

prima-fresh-festival-soutez-listky-2024.jpg

1108 ms

internet_a_televize_se_slevou.jpg

internet_a_televize_se_slevou.jpg

1089 ms

jak-internet-meni-nas-mozek.jpg

jak-internet-meni-nas-mozek.jpg

1000 ms

shutterstock_1306815715-d.jpg

shutterstock_1306815715-d.jpg

1003 ms

zavolame_vam_-_nordic_telecom.jpg

zavolame_vam_-_nordic_telecom.jpg

1108 ms

ajtaka_na_prijmi_-_nordic_telecom.jpg

ajtaka_na_prijmi_-_nordic_telecom.jpg

1111 ms

success.png

success.png

1111 ms

a65cb41cdc472c0555a24743376eaa88.ttf

a65cb41cdc472c0555a24743376eaa88.ttf

1266 ms

cc90ab08cef32b25dff8a2e9cac9152c.ttf

cc90ab08cef32b25dff8a2e9cac9152c.ttf

1169 ms

70d44b11be934b7f5157fecabbcd4d63.otf

70d44b11be934b7f5157fecabbcd4d63.otf

1277 ms

b655dc3e.js

b655dc3e.js

357 ms

rc.js

rc.js

825 ms

destination

destination

72 ms

destination

destination

113 ms

fbevents.js

fbevents.js

39 ms

recorder.js

recorder.js

379 ms

9fuvv1ows0

9fuvv1ows0

69 ms

plausible.js

plausible.js

110 ms

tr.js

tr.js

381 ms

OOWidget.js

OOWidget.js

967 ms

js

js

109 ms

540349659750398

540349659750398

270 ms

clarity.js

clarity.js

43 ms

265 ms

activityi;src=11209438;type=norcz1;cat=norviscz;ord=9880108614197;npa=0;auiddc=1010238236.1716398255;pscdl=noapi;frm=0;gtm=45fe45k0v9181816829z8834424003za201zb834424003;gcd=13l3l3l3l1;dma=0;epver=2;~oref=https%3A%2F%2Fnordictelecom.cz%2F

activityi;src=11209438;type=norcz1;cat=norviscz;ord=9880108614197;npa=0;auiddc=1010238236.1716398255;pscdl=noapi;frm=0;gtm=45fe45k0v9181816829z8834424003za201zb834424003;gcd=13l3l3l3l1;dma=0;epver=2;~oref=https%3A%2F%2Fnordictelecom.cz%2F

296 ms

391520868075224

391520868075224

63 ms

38 ms

src=11209438;type=norcz1;cat=norviscz;ord=9880108614197;npa=0;auiddc=*;pscdl=noapi;frm=0;gtm=45fe45k0v9181816829z8834424003za201zb834424003;gcd=13l3l3l3l1;dma=0;epver=2;~oref=https%3A%2F%2Fnordictelecom.cz%2F

src=11209438;type=norcz1;cat=norviscz;ord=9880108614197;npa=0;auiddc=*;pscdl=noapi;frm=0;gtm=45fe45k0v9181816829z8834424003za201zb834424003;gcd=13l3l3l3l1;dma=0;epver=2;~oref=https%3A%2F%2Fnordictelecom.cz%2F

83 ms

retargeting

retargeting

99 ms

Accessibility Review

dat.cz accessibility score

79

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not match their roles

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Buttons do not have an accessible name

High

Links do not have a discernible name

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Best Practices

dat.cz best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

dat.cz SEO score

89

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    CS

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dat.cz can be misinterpreted by Google and other search engines. Our service has detected that Czech is used on the page, and it matches the claimed language. Our system also found out that Dat.cz main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

dat.cz

Open Graph data is detected on the main page of Dat. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: