Access dsl.cz. DSL.cz

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%

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.

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 789.4 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 524.8 kB

Original 789.4 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 524.8 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 Now

After Optimization

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 Issues

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.

High

Buttons do not have an accessible name

High

Form elements do not have associated labels

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

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

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Page has valid source maps

Search Engine Optimization Advices

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/).

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:

Report Summary

Performance

Accessibility

Best Practices

SEO

DSL.cz

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

dsl.cz

www.dsl.cz

19843a2fc69207c40d0bf16d218bdfcd.css

c572f915cfab59ecdd50e9c94e88c737.js

integration

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

dsl.cz

www.dsl.cz

19843a2fc69207c40d0bf16d218bdfcd.css

c572f915cfab59ecdd50e9c94e88c737.js

integration

c0c240b30f09921cf6009825e4d9e87f.js

gpt.js

dc.js

logo.png

1cf90e78a85ad11520d6750e58c728f3.png

40.png

41.png

42.png

icon_speedtest.png

icon_map_mobile_app.png

icon_article_speed.png

31.png

29.png

18.png

28.png

icon_how_to.png

icon_optimization.png

icon_faq.png

icon_term_list.png

icon_tile_map.png

icon_tile_checker.png

icon_tile_speedtest.png

icon_tile_optimization.png

icon_footer_1.png

icon_footer_2.png

icon_footer_3.png

icon_footer_4.png

logo_small.png

google_download.png

apple_download.png

pixel

Pug

OpenSans.woff

OpenSans-Bold.woff

fontawesome-webfont.woff

pubads_impl_81.js

sync

bg_tile.png