Access rozhlas.cz. Portál Českého rozhlasu

20

Performance

Renders faster than
37% of other websites
70

Accessibility

Visual factors better than
that of 35% of websites
83

Best Practices

More advanced features
available than in
55% of websites
77

SEO

Google-friendlier than
36% of websites

First Response

517 ms

Resources Loaded

40.3 sec

Page Rendered

2.3 sec

About Website

Welcome to rozhlas.cz homepage info - get ready to check Rozhlas best content for Czech Republic right away, or after learning these important things about rozhlas.cz

Nejrychlejší zpravodajství a vysílání online. Stanice, program, podcasty, nové rozhovory, rozhlasové hry a audioknihy.

Visit rozhlas.cz

Key Findings

We analyzed Rozhlas.cz page load time and found that the first response time was 517 ms and then it took 42.6 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there were 4 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

name

value

score

weighting

FCP (First Contentful Paint)

Value8.8 s

0/100

10%

LCP (Largest Contentful Paint)

Value16.0 s

0/100

25%

SI (Speed Index)

Value11.2 s

5/100

10%

TBT (Total Blocking Time)

Value1,280 ms

18/100

30%

CLS (Cumulative Layout Shift)

Value0.103

89/100

15%

TTI (Time to Interactive)

Value18.0 s

3/100

10%

rozhlas.cz

517 ms

www.rozhlas.cz

527 ms

portal.rozhlas.cz

740 ms

cssGBjzmUY-Gc71J7kBt1Tc6sRlgH2c7wx3VctlmKm8IowsSB7f98RLOfPak35RdjzqlB59LWbqKktkJqDTv1TPko__MDVaI8Jh7c3M7XGde2fgB9UFepjZlSUMn2Nm5CbCILk.css

202 ms

css2GiARazTPkqbJXkQDl2P0cJoUew42XRSmDKK1Y8VACwqprGZRNLqiO1IQOpUQV8twZWpGVqH2ZFjufGZrQFEj8__MDVaI8Jh7c3M7XGde2fgB9UFepjZlSUMn2Nm5CbCILk.css

304 ms

Our browser made a total of 97 requests to load all elements on the main page. We found that 2% of them (2 requests) were addressed to the original Rozhlas.cz, 81% (79 requests) were made to Portal.rozhlas.cz and 3% (3 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (34.6 sec) relates to the external source Api.rozhlas.cz.

Content Size

3.9 MB

After Optimization

3.2 MB

In fact, the total size of Rozhlas.cz main page is 3.9 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. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 2.7 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 395.2 kB

Original 467.5 kB
After minification 455.4 kB
After compression 72.3 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 395.2 kB or 85% of the original size.

Image Optimization

-4%

Potential reduce by 103.2 kB

Original 2.7 MB
After minification 2.6 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. Rozhlas images are well optimized though.

JavaScript Optimization

-26%

Potential reduce by 82.6 kB

Original 319.5 kB
After minification 319.4 kB
After compression 236.9 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 82.6 kB or 26% of the original size.

CSS Optimization

-26%

Potential reduce by 93.3 kB

Original 359.8 kB
After minification 359.8 kB
After compression 266.5 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. Rozhlas.cz needs all CSS files to be minified and compressed as it can save up to 93.3 kB or 26% of the original size.

Requests Now

After Optimization

The browser has sent 86 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Rozhlas. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 25 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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

High

ARIA IDs are not unique

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

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

Low

Detected JavaScript libraries

High

Page has valid source maps

Search Engine Optimization Advices

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

High

Links are not crawlable

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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 Rozhlas.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 Rozhlas.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

rozhlas.cz

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Portál Českého rozhlasu

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)