Report Summary

  • 24

    Performance

    Renders faster than
    44% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 50% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 97

    SEO

    Google-friendlier than
    92% of websites

dsl.cz

DSL.cz

Page Load Speed

2.5 sec in total

First Response

239 ms

Resources Loaded

2.1 sec

Page Rendered

191 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 239 ms and then it took 2.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

dsl.cz performance score

24

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

35/100

10%

LCP (Largest Contentful Paint)

Value11.0 s

0/100

25%

SI (Speed Index)

Value7.3 s

28/100

10%

TBT (Total Blocking Time)

Value2,370 ms

5/100

30%

CLS (Cumulative Layout Shift)

Value0.022

100/100

15%

TTI (Time to Interactive)

Value14.3 s

9/100

10%

Network Requests Diagram

dsl.cz

239 ms

www.dsl.cz

283 ms

19843a2fc69207c40d0bf16d218bdfcd.css

223 ms

c572f915cfab59ecdd50e9c94e88c737.js

442 ms

integration

197 ms

Our browser made a total of 99 requests to load all elements on the main page. We found that 41% of them (41 requests) were addressed to the original Dsl.cz, 12% (12 requests) were made to 4236808.fls.doubleclick.net and 6% (6 requests) were made to Cm.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (958 ms) belongs to the original domain Dsl.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 714.8 kB (54%)

Content Size

1.3 MB

After Optimization

602.9 kB

In fact, the total size of Dsl.cz main page is 1.3 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. 50% of websites need less resources to load. Javascripts take 789.5 kB which makes up the majority of the site volume.

HTML Optimization

-69%

Potential reduce by 106.5 kB

  • Original 155.2 kB
  • After minification 154.7 kB
  • After compression 48.8 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 106.5 kB or 69% of the original size.

Image Optimization

-10%

Potential reduce by 29.5 kB

  • Original 301.5 kB
  • After minification 272.0 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. DSL images are well optimized though.

JavaScript Optimization

-66%

Potential reduce by 524.9 kB

  • Original 789.5 kB
  • After minification 789.3 kB
  • After compression 264.6 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 524.9 kB or 66% of the original size.

CSS Optimization

-75%

Potential reduce by 54.0 kB

  • Original 71.5 kB
  • After minification 69.5 kB
  • After compression 17.5 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 needs all CSS files to be minified and compressed as it can save up to 54.0 kB or 75% of the original size.

Requests Breakdown

Number of requests can be reduced by 41 (47%)

Requests Now

88

After Optimization

47

The browser has sent 88 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 21 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Review

dsl.cz accessibility score

80

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

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.

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

75

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

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

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: