Tools & Wizards About Us
chmi.cz screenshot

Report Summary

  • 5

    Performance

    Renders faster than
    21% of other websites

  • 62

    Accessibility

    Visual factors better than
    that of 28% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 50

    SEO

    Google-friendlier than
    19% of websites

chmi.cz

Úvod

Page Load Speed

8.4 sec in total

First Response

297 ms

Resources Loaded

7.8 sec

Page Rendered

282 ms

chmi.cz screenshot

About Website

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

Úvodní stránka Českého hydrometeorologického ústav​​​​​u

Visit chmi.cz

Key Findings

We analyzed Chmi.cz page load time and found that the first response time was 297 ms and then it took 8.1 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

chmi.cz performance score

5

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.6 s

5/100

10%

LCP (Largest Contentful Paint)

Value12.9 s

0/100

25%

SI (Speed Index)

Value18.7 s

0/100

10%

TBT (Total Blocking Time)

Value6,290 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.373

28/100

15%

TTI (Time to Interactive)

Value26.0 s

0/100

10%

Network Requests Diagram

chmi.cz

297 ms

www.chmi.cz

709 ms

reset.css

282 ms

main.css

282 ms

user.css

284 ms

Our browser made a total of 127 requests to load all elements on the main page. We found that 85% of them (108 requests) were addressed to the original Chmi.cz, 6% (8 requests) were made to Youtube.com and 3% (4 requests) were made to Jnn-pa.googleapis.com. The less responsive or slowest element that took the longest time to load (2.6 sec) belongs to the original domain Chmi.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 505.7 kB (32%)

Content Size

1.6 MB

After Optimization

1.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Chmi.cz main page is 1.6 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. Images take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 69.8 kB

  • Original 86.5 kB
  • After minification 72.6 kB
  • After compression 16.7 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 13.9 kB, which is 16% 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 69.8 kB or 81% of the original size.

Image Optimization

-34%

Potential reduce by 410.4 kB

  • Original 1.2 MB
  • After minification 786.3 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, Chmi needs image optimization as it can save up to 410.4 kB or 34% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-2%

Potential reduce by 2.5 kB

  • Original 160.2 kB
  • After minification 160.2 kB
  • After compression 157.7 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

-17%

Potential reduce by 22.9 kB

  • Original 135.2 kB
  • After minification 135.0 kB
  • After compression 112.3 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. Chmi.cz needs all CSS files to be minified and compressed as it can save up to 22.9 kB or 17% of the original size.

Requests Breakdown

Number of requests can be reduced by 48 (40%)

Requests Now

121

After Optimization

73

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 121 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chmi. 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 from 18 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

chmi.cz

chmi.cz

297 ms

www.chmi.cz

www.chmi.cz

709 ms

reset.css

reset.css

282 ms

main.css

main.css

282 ms

user.css

user.css

284 ms

cookie.css

cookie.css

284 ms

jquery.js

jquery.js

472 ms

jquery-ui.css

jquery-ui.css

285 ms

jquery-ui.js

jquery-ui.js

935 ms

encoding-indexes.js

encoding-indexes.js

564 ms

encoding.js

encoding.js

658 ms

header-builder.js

header-builder.js

565 ms

chmu.css

chmu.css

580 ms

addon.css

addon.css

752 ms

fatwire.css

fatwire.css

845 ms

portlet.css

portlet.css

846 ms

iclidata-full-css.css

iclidata-full-css.css

860 ms

theme.css

theme.css

957 ms

common.js

common.js

1052 ms

chmu.js

chmu.js

1125 ms

aim_isko_mapa.js

aim_isko_mapa.js

1126 ms

calendar.js

calendar.js

1238 ms

calendar-cs.js

calendar-cs.js

1214 ms

calendar-setup.js

calendar-setup.js

1219 ms

cookie.js

cookie.js

1332 ms

weatherXY.css

weatherXY.css

1406 ms

weatherRcol.css

weatherRcol.css

1407 ms

weatherCR.css

weatherCR.css

1495 ms

banner-meteorologie.png

banner-meteorologie.png

707 ms

banner-ovzdusi.png

banner-ovzdusi.png

706 ms

banner-hydrologie.png

banner-hydrologie.png

741 ms

bg-body.gif

bg-body.gif

542 ms

bg.gif

bg.gif

540 ms

logo.gif

logo.gif

577 ms

bg-header-holder-wide.png

bg-header-holder-wide.png

971 ms

bg-header-wide.png

bg-header-wide.png

1066 ms

bg-logo.png

bg-logo.png

1065 ms

bg-link-english.gif

bg-link-english.gif

1062 ms

bg-link-sitemap.gif

bg-link-sitemap.gif

1066 ms

nav-bg-wide.png

nav-bg-wide.png

1066 ms

nav8.gif

nav8.gif

1252 ms

blank.gif

blank.gif

1344 ms

nav9.gif

nav9.gif

1345 ms

nav3.gif

nav3.gif

1348 ms

nav2.gif

nav2.gif

1347 ms

nav4.gif

nav4.gif

1345 ms

nav5.gif

nav5.gif

1533 ms

nav6.gif

nav6.gif

1624 ms

nav7.gif

nav7.gif

1626 ms

bg-content-holder-wide.png

bg-content-holder-wide.png

1626 ms

bg-content-wide.png

bg-content-wide.png

1627 ms

bg-content-body-wide.png

bg-content-body-wide.png

1627 ms

bg-warnings.gif

bg-warnings.gif

1813 ms

h3-warnings.gif

h3-warnings.gif

1904 ms

spacer.gif

spacer.gif

1906 ms

Tresen_pomrzle_kvety_mini.jpg

Tresen_pomrzle_kvety_mini.jpg

2093 ms

Sahara_2024_mini.jpg

Sahara_2024_mini.jpg

2001 ms

TZ-rocni_zprava_2023_mini.jpg

TZ-rocni_zprava_2023_mini.jpg

2002 ms

env_logo_male.png

env_logo_male.png

2094 ms

wmo.gif

wmo.gif

2185 ms

cmes.gif

cmes.gif

2187 ms

ecmwf.jpg

ecmwf.jpg

2281 ms

co2.jpg

co2.jpg

2282 ms

alert.xml

alert.xml

2359 ms

vHwepMH2AMU

vHwepMH2AMU

86 ms

m4ly9--TfRM

m4ly9--TfRM

450 ms

www-player.css

www-player.css

12 ms

www-embed-player.js

www-embed-player.js

32 ms

base.js

base.js

56 ms

ad_status.js

ad_status.js

269 ms

jRYISRuM9q7e_xyYaLp_fsq3qnLjbNevd8JDa-bOkpI.js

jRYISRuM9q7e_xyYaLp_fsq3qnLjbNevd8JDa-bOkpI.js

217 ms

embed.js

embed.js

135 ms

CR.html

CR.html

1840 ms

PredIco.html

PredIco.html

1929 ms

weather-links.html

weather-links.html

1932 ms

aktual.html

aktual.html

2026 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

53 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

140 ms

Create

Create

108 ms

Create

Create

111 ms

agropocasi.html

agropocasi.html

1996 ms

meteoalarm_logo_male.gif

meteoalarm_logo_male.gif

2083 ms

id

id

85 ms

nkp.jpg

nkp.jpg

1689 ms

GenerateIT

GenerateIT

15 ms

GenerateIT

GenerateIT

16 ms

eea.jpg

eea.jpg

1688 ms

eumet.jpg

eumet.jpg

1694 ms

isdr.gif

isdr.gif

1786 ms

logo_cnv_onk_male.png

logo_cnv_onk_male.png

1785 ms

ecomet.jpg

ecomet.jpg

1873 ms

CzechGlobe_logo_male.png

CzechGlobe_logo_male.png

1687 ms

CRA2.png

CRA2.png

1688 ms

CNVH_logo_male.jpg

CNVH_logo_male.jpg

1695 ms

88x31.png

88x31.png

1786 ms

bg-bookmark-pocasi.png

bg-bookmark-pocasi.png

1785 ms

bg-bookmark-voda.png

bg-bookmark-voda.png

1874 ms

bg-bookmark-ovzdusi.png

bg-bookmark-ovzdusi.png

1688 ms

h3-news.gif

h3-news.gif

1688 ms

square-green.gif

square-green.gif

1696 ms

h3-actualities.gif

h3-actualities.gif

1785 ms

square-grey.gif

square-grey.gif

1786 ms

bg-footer-holder-wide.png

bg-footer-holder-wide.png

1873 ms

bg-footer-wide.png

bg-footer-wide.png

1688 ms

CR.png

CR.png

1587 ms

Image8.gif

Image8.gif

1220 ms

Image3.gif

Image3.gif

1313 ms

Image2.gif

Image2.gif

1313 ms

ImageM8.gif

ImageM8.gif

1314 ms

ImageM9.gif

ImageM9.gif

1315 ms

ImageM25.gif

ImageM25.gif

1414 ms

bg-weather-other-day.png

bg-weather-other-day.png

1507 ms

index-compact-all.html

index-compact-all.html

1411 ms

index-compact-observed.html

index-compact-observed.html

1500 ms

gtm.js

gtm.js

41 ms

agropocasi_mini.jpg

agropocasi_mini.jpg

1586 ms

hamr_LOGA_NEW_CROPPED.png

hamr_LOGA_NEW_CROPPED.png

1592 ms

upoutavka_rocenky_web.png

upoutavka_rocenky_web.png

2612 ms

hamr_LOGA_NEW_CROPPED.png

hamr_LOGA_NEW_CROPPED.png

1779 ms

log_event

log_event

29 ms

js

js

37 ms

log_event

log_event

23 ms

vendor.6183d846.min.css

vendor.6183d846.min.css

375 ms

main.6183d846.min.css

main.6183d846.min.css

367 ms

vendor.6183d846.min.js

vendor.6183d846.min.js

744 ms

main.6183d846.min.js

main.6183d846.min.js

655 ms

print.css

print.css

95 ms

Accessibility Review

chmi.cz accessibility score

62

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

<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

chmi.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

chmi.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 Chmi.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 Chmi.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

chmi.cz

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