Report Summary

  • 18

    Performance

    Renders faster than
    35% of other websites

  • 56

    Accessibility

    Visual factors better than
    that of 23% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 50

    SEO

    Google-friendlier than
    18% of websites

chmu.cz

Portál ČHMÚ : Home

Page Load Speed

9.4 sec in total

First Response

354 ms

Resources Loaded

8.2 sec

Page Rendered

872 ms

chmu.cz screenshot

About Website

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

copyright čhmú

Visit chmu.cz

Key Findings

We analyzed Chmu.cz page load time and found that the first response time was 354 ms and then it took 9 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

chmu.cz performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.3 s

7/100

10%

LCP (Largest Contentful Paint)

Value5.4 s

20/100

25%

SI (Speed Index)

Value11.1 s

6/100

10%

TBT (Total Blocking Time)

Value1,210 ms

20/100

30%

CLS (Cumulative Layout Shift)

Value0.351

31/100

15%

TTI (Time to Interactive)

Value12.6 s

14/100

10%

Network Requests Diagram

chmu.cz

354 ms

portal.chmi.cz

1236 ms

reset.css

215 ms

main.css

325 ms

jquery.js

2370 ms

Our browser made a total of 130 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Chmu.cz, 84% (109 requests) were made to Portal.chmi.cz and 15% (20 requests) were made to Chmi.cz. The less responsive or slowest element that took the longest time to load (3.6 sec) relates to the external source Portal.chmi.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 259.8 kB (9%)

Content Size

2.8 MB

After Optimization

2.5 MB

In fact, the total size of Chmu.cz main page is 2.8 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. 30% of websites need less resources to load. Images take 2.6 MB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 63.3 kB

  • Original 78.9 kB
  • After minification 64.8 kB
  • After compression 15.6 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. This page needs HTML code to be minified as it can gain 14.1 kB, which is 18% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 63.3 kB or 80% of the original size.

Image Optimization

-4%

Potential reduce by 93.8 kB

  • Original 2.6 MB
  • After minification 2.5 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. Chmu images are well optimized though.

CSS Optimization

-85%

Potential reduce by 102.6 kB

  • Original 120.3 kB
  • After minification 84.2 kB
  • After compression 17.6 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. Chmu.cz needs all CSS files to be minified and compressed as it can save up to 102.6 kB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 38 (36%)

Requests Now

105

After Optimization

67

The browser has sent 105 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chmu. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

chmu.cz accessibility score

56

Accessibility Issues

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.

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Tables and lists

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

Impact

Issue

High

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

Best Practices

chmu.cz best practices score

58

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

chmu.cz SEO score

50

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

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    CS

  • Encoding

    WINDOWS-1250

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Chmu.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 Chmu.cz main page’s claimed encoding is windows-1250. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of Chmu. 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: