Tools & Wizards About Us
dsl.cz screenshot

Report Summary

  • 33

    Performance

    Renders faster than
    53% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 97

    SEO

    Google-friendlier than
    91% of websites

dsl.cz

DSL.cz

Page Load Speed

2.8 sec in total

First Response

420 ms

Resources Loaded

2.2 sec

Page Rendered

175 ms

dsl.cz screenshot

About Website

Visit dsl.cz now to see the best up-to-date DSL content for Czech Republic and also check out these interesting facts you probably never knew about dsl.cz

Změřte si rychlost internetu, sledujte vývoj rychlosti a srovnání operátorů v pravidelných statistikách. Ověřte si dostupnost internetu na vaší adrese. Prohlédněte si mapy pokrytí všech operátorů v ČR...

Visit dsl.cz

Key Findings

We analyzed Dsl.cz page load time and found that the first response time was 420 ms and then it took 2.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

dsl.cz performance score

33

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.2 s

42/100

10%

LCP (Largest Contentful Paint)

Value9.5 s

0/100

25%

SI (Speed Index)

Value6.6 s

37/100

10%

TBT (Total Blocking Time)

Value970 ms

28/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value12.7 s

14/100

10%

Network Requests Diagram

dsl.cz

420 ms

www.dsl.cz

359 ms

e5eacfa4f0d44cf1a6f7e482b44ab86f.js

165 ms

2588ed2b08be2e00fcc40c4ad4f3ba0e.css

326 ms

29ad833887ce534e16c8916f6a2c443c.js

415 ms

Our browser made a total of 48 requests to load all elements on the main page. We found that 67% of them (32 requests) were addressed to the original Dsl.cz, 13% (6 requests) were made to Use.typekit.net and 6% (3 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (641 ms) belongs to the original domain Dsl.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 26.9 kB (14%)

Content Size

195.4 kB

After Optimization

168.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dsl.cz main page is 195.4 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 50% of websites need less resources to load. Javascripts take 105.7 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 18.5 kB

  • Original 24.8 kB
  • After minification 24.4 kB
  • After compression 6.3 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 18.5 kB or 75% of the original size.

Image Optimization

-24%

Potential reduce by 8.1 kB

  • Original 34.2 kB
  • After minification 26.2 kB

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. Obviously, DSL needs image optimization as it can save up to 8.1 kB or 24% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-0%

Potential reduce by 18 B

  • Original 105.7 kB
  • After minification 105.7 kB
  • After compression 105.7 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

-1%

Potential reduce by 217 B

  • Original 30.6 kB
  • After minification 30.6 kB
  • After compression 30.4 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. Dsl.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 16 (42%)

Requests Now

38

After Optimization

22

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DSL. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

dsl.cz

dsl.cz

420 ms

www.dsl.cz

www.dsl.cz

359 ms

e5eacfa4f0d44cf1a6f7e482b44ab86f.js

e5eacfa4f0d44cf1a6f7e482b44ab86f.js

165 ms

2588ed2b08be2e00fcc40c4ad4f3ba0e.css

2588ed2b08be2e00fcc40c4ad4f3ba0e.css

326 ms

29ad833887ce534e16c8916f6a2c443c.js

29ad833887ce534e16c8916f6a2c443c.js

415 ms

gtm.js

gtm.js

116 ms

logo.png

logo.png

82 ms

header_phone.png

header_phone.png

80 ms

home_white.svg

home_white.svg

193 ms

40.png

40.png

194 ms

41.png

41.png

195 ms

42.png

42.png

253 ms

icon_speedtest.png

icon_speedtest.png

253 ms

icon_map_mobile_app.png

icon_map_mobile_app.png

253 ms

icon_article_speed.png

icon_article_speed.png

325 ms

31.png

31.png

326 ms

29.png

29.png

325 ms

18.png

18.png

327 ms

28.png

28.png

326 ms

icon_how_to.png

icon_how_to.png

327 ms

icon_optimization.png

icon_optimization.png

363 ms

icon_faq.png

icon_faq.png

363 ms

icon_term_list.png

icon_term_list.png

363 ms

banner-jaro-1920-400.webp

banner-jaro-1920-400.webp

630 ms

face_checker.png

face_checker.png

398 ms

loader_light.gif

loader_light.gif

398 ms

25.svg

25.svg

445 ms

18.svg

18.svg

444 ms

19.svg

19.svg

442 ms

17.svg

17.svg

479 ms

ul_li_footer.png

ul_li_footer.png

478 ms

logo_small.png

logo_small.png

522 ms

d

d

48 ms

d

d

96 ms

d

d

97 ms

d

d

97 ms

d

d

97 ms

d

d

95 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

641 ms

js

js

88 ms

destination

destination

155 ms

fbevents.js

fbevents.js

43 ms

100486775805.js

100486775805.js

401 ms

loader.js

loader.js

194 ms

webtracking.min.js

webtracking.min.js

535 ms

hotjar-3163130.js

hotjar-3163130.js

147 ms

modules.842bcec28f9fd12bb79e.js

modules.842bcec28f9fd12bb79e.js

19 ms

widget.js

widget.js

37 ms

Accessibility Review

dsl.cz accessibility score

82

Accessibility Issues

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

Form elements do not have associated labels

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

dsl.cz best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

dsl.cz SEO score

97

Search Engine Optimization Advices

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 Dsl.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 Dsl.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

dsl.cz

Open Graph description is not detected on the main page of DSL. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: