Report Summary

  • 26

    Performance

    Renders faster than
    47% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 37% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 92

    SEO

    Google-friendlier than
    75% 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 70% 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 1.0 MB (33%)

Content Size

3.1 MB

After Optimization

2.1 MB

In fact, the total size of Onlinejazyky.cz main page is 3.1 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

-66%

Potential reduce by 583.6 kB

  • Original 878.6 kB
  • After minification 852.4 kB
  • After compression 294.9 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 583.6 kB or 66% 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

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.

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

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: