Tools & Wizards About Us
onlinejazyky.cz screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

onlinejazyky.cz

Jazykov? kurzy z pohodl? domova - ONLINE jazyky

Page Load Speed

5.5 sec in total

First Response

443 ms

Resources Loaded

4.7 sec

Page Rendered

416 ms

onlinejazyky.cz screenshot

About Website

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

Online jazykov? kurzy pro za??te?n?ky, pokro?il? a r?zn? profese. Atraktivn?, z?bavn? a jednoduch? angli?tina, francouz?tina, n?m?ina a ?pan?l?tina.

Visit onlinejazyky.cz

Key Findings

We analyzed Onlinejazyky.cz page load time and found that the first response time was 443 ms and then it took 5.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

onlinejazyky.cz performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.3 s

18/100

10%

LCP (Largest Contentful Paint)

Value11.6 s

0/100

25%

SI (Speed Index)

Value7.5 s

26/100

10%

TBT (Total Blocking Time)

Value1,280 ms

18/100

30%

CLS (Cumulative Layout Shift)

Value0.018

100/100

15%

TTI (Time to Interactive)

Value14.4 s

9/100

10%

Network Requests Diagram

onlinejazyky.cz

443 ms

onlinejazyky.cz

550 ms

www.onlinejazyky.cz

339 ms

www.onlinejazyky.cz

671 ms

bootstrap.min.css

126 ms

Our browser made a total of 93 requests to load all elements on the main page. We found that 70% of them (65 requests) were addressed to the original Onlinejazyky.cz, 12% (11 requests) were made to Shared.optimato.cz and 2% (2 requests) were made to Googleadservices.com. The less responsive or slowest element that took the longest time to load (1.8 sec) belongs to the original domain Onlinejazyky.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.1 MB (34%)

Content Size

3.2 MB

After Optimization

2.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Onlinejazyky.cz main page is 3.2 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. 55% of websites need less resources to load. Images take 2.0 MB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 22.2 kB

  • Original 29.9 kB
  • After minification 26.0 kB
  • After compression 7.7 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 3.9 kB, which is 13% 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 22.2 kB or 74% of the original size.

Image Optimization

-11%

Potential reduce by 225.6 kB

  • Original 2.0 MB
  • After minification 1.8 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. Obviously, ONLINE Jazyky needs image optimization as it can save up to 225.6 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-67%

Potential reduce by 619.8 kB

  • Original 926.1 kB
  • After minification 899.9 kB
  • After compression 306.2 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 619.8 kB or 67% of the original size.

CSS Optimization

-83%

Potential reduce by 211.1 kB

  • Original 255.7 kB
  • After minification 224.6 kB
  • After compression 44.6 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. Onlinejazyky.cz needs all CSS files to be minified and compressed as it can save up to 211.1 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 48 (55%)

Requests Now

87

After Optimization

39

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 87 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ONLINE Jazyky. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 28 to 1 for JavaScripts and from 16 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

onlinejazyky.cz

onlinejazyky.cz

443 ms

onlinejazyky.cz

onlinejazyky.cz

550 ms

www.onlinejazyky.cz

www.onlinejazyky.cz

339 ms

www.onlinejazyky.cz

www.onlinejazyky.cz

671 ms

bootstrap.min.css

bootstrap.min.css

126 ms

webfont.css

webfont.css

260 ms

elusive-webfont.css

elusive-webfont.css

380 ms

jquery-ui-1.10.3.custom.min.css

jquery-ui-1.10.3.custom.min.css

382 ms

main.css

main.css

389 ms

ico.css

ico.css

375 ms

magnific-popup.css

magnific-popup.css

381 ms

popover.css

popover.css

376 ms

feature.css

feature.css

492 ms

blog.css

blog.css

511 ms

jquery-1.10.2.min.js

jquery-1.10.2.min.js

739 ms

highslide.js

highslide.js

697 ms

highslide_conf.js

highslide_conf.js

593 ms

highslide.css

highslide.css

601 ms

styles.php

styles.php

514 ms

dyn.css

dyn.css

513 ms

jsfx.js

jsfx.js

599 ms

efekty.js

efekty.js

628 ms

jquery.forms.js

jquery.forms.js

516 ms

slidehide.js

slidehide.js

639 ms

ruzne.js

ruzne.js

705 ms

eshop.js

eshop.js

711 ms

jquery-ui-1.10.3.custom.min.js

jquery-ui-1.10.3.custom.min.js

720 ms

jquery.scrollTo-min.js

jquery.scrollTo-min.js

635 ms

jquery.magnific-popup.min.js

jquery.magnific-popup.min.js

639 ms

OnlineJazykyPage.js

OnlineJazykyPage.js

640 ms

optimato.js

optimato.js

636 ms

jquery.ui.touch-punch.js

jquery.ui.touch-punch.js

713 ms

jplayer.blue.monday.css

jplayer.blue.monday.css

782 ms

jquery.jplayer.min.js

jquery.jplayer.min.js

783 ms

jplayer.playlist.min.js

jplayer.playlist.min.js

782 ms

jquery.jplayer.inspector.js

jquery.jplayer.inspector.js

786 ms

bootstrap.min.js

bootstrap.min.js

834 ms

script.js

script.js

779 ms

tracking.js

tracking.js

886 ms

conversion.js

conversion.js

34 ms

loader.js

loader.js

998 ms

stranka-0.jpg

stranka-0.jpg

1295 ms

logo@2x.png

logo@2x.png

242 ms

menu_more@2x.png

menu_more@2x.png

122 ms

help-line@2x.png

help-line@2x.png

477 ms

ico-chevron-down@2x.png

ico-chevron-down@2x.png

133 ms

block-back-bottom@2x.png

block-back-bottom@2x.png

119 ms

screens.png

screens.png

800 ms

map-main@2x.png

map-main@2x.png

746 ms

map-en@2x.png

map-en@2x.png

373 ms

map-de@2x.png

map-de@2x.png

358 ms

map-fr@2x.png

map-fr@2x.png

594 ms

map-es@2x.png

map-es@2x.png

494 ms

map-ru@2x.png

map-ru@2x.png

596 ms

icon-en@2x.png

icon-en@2x.png

616 ms

icon-de@2x.png

icon-de@2x.png

716 ms

icon-fr@2x.png

icon-fr@2x.png

715 ms

icon-es@2x.png

icon-es@2x.png

739 ms

icon-ru@2x.png

icon-ru@2x.png

836 ms

akce.jpg

akce.jpg

1188 ms

icon-globus@2x.png

icon-globus@2x.png

978 ms

icon-vyuka@2x.png

icon-vyuka@2x.png

866 ms

icon-garance@2x.png

icon-garance@2x.png

914 ms

browser.png

browser.png

1071 ms

partners@2x.png

partners@2x.png

994 ms

ProximaNova-Reg-webfont.woff

ProximaNova-Reg-webfont.woff

1112 ms

ProximaNova-Sbold-webfont.woff

ProximaNova-Sbold-webfont.woff

1309 ms

Elusive-Icons.woff

Elusive-Icons.woff

1253 ms

ProximaNova-Bold-webfont.woff

ProximaNova-Bold-webfont.woff

1283 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

1253 ms

logo2@2x.png

logo2@2x.png

1279 ms

footer-banner@2x.jpg

footer-banner@2x.jpg

1790 ms

icon-facebook@2x.png

icon-facebook@2x.png

1339 ms

icon-twitter@2x.png

icon-twitter@2x.png

1364 ms

icon-googleplus@2x.png

icon-googleplus@2x.png

1402 ms

icon-linkedin@2x.png

icon-linkedin@2x.png

1402 ms

ico-chevron-up@2x.png

ico-chevron-up@2x.png

1425 ms

68 ms

gtm.js

gtm.js

131 ms

dot.asp

dot.asp

522 ms

styles.css

styles.css

125 ms

39 ms

analytics.js

analytics.js

55 ms

conversion_async.js

conversion_async.js

19 ms

retargeting.js

retargeting.js

458 ms

12 ms

37 ms

collect

collect

12 ms

collect

collect

58 ms

retargeting

retargeting

113 ms

smartchat-2.1.1.min.css

smartchat-2.1.1.min.css

172 ms

smartchat-2.1.1.min.js

smartchat-2.1.1.min.js

298 ms

loading.gif

loading.gif

415 ms

Accessibility Review

onlinejazyky.cz accessibility score

71

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.

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

onlinejazyky.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

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

onlinejazyky.cz SEO score

92

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

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

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    N/A

  • Encoding

    WINDOWS-1250

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Onlinejazyky.cz can be misinterpreted by Google and other search engines. Our service has detected that Czech is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Onlinejazyky.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

onlinejazyky.cz

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