Tools & Wizards About Us
skolaonline.cz screenshot

Report Summary

  • 55

    Performance

    Renders faster than
    73% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 90% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 67

    SEO

    Google-friendlier than
    25% of websites

skolaonline.cz

Škola OnLine - nejrozšířenější webový školní informační systém

Page Load Speed

4.5 sec in total

First Response

420 ms

Resources Loaded

3.9 sec

Page Rendered

147 ms

skolaonline.cz screenshot

About Website

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

Škola OnLine je moderní školní informační systém, který umožňuje rychle a efektivně zpracovávat veškerou školní agendu při zachování vysokého uživatelského komfortu. Jedná se o webovou aplikaci, což z...

Visit skolaonline.cz

Key Findings

We analyzed Skolaonline.cz page load time and found that the first response time was 420 ms and then it took 4.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

skolaonline.cz performance score

55

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.5 s

6/100

10%

LCP (Largest Contentful Paint)

Value8.2 s

2/100

25%

SI (Speed Index)

Value8.5 s

18/100

10%

TBT (Total Blocking Time)

Value40 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.017

100/100

15%

TTI (Time to Interactive)

Value5.6 s

69/100

10%

Network Requests Diagram

skolaonline.cz

420 ms

default.css

554 ms

SearchSkinObjectPreview.css

259 ms

skin.css

387 ms

container.css

259 ms

Our browser made a total of 41 requests to load all elements on the main page. We found that 90% of them (37 requests) were addressed to the original Skolaonline.cz, 5% (2 requests) were made to Cdnjs.cloudflare.com and 5% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.8 sec) belongs to the original domain Skolaonline.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.0 MB (62%)

Content Size

1.6 MB

After Optimization

611.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Skolaonline.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. 35% of websites need less resources to load. Javascripts take 1.0 MB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 17.0 kB

  • Original 24.1 kB
  • After minification 21.8 kB
  • After compression 7.1 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 17.0 kB or 70% of the original size.

Image Optimization

-2%

Potential reduce by 7.0 kB

  • Original 396.5 kB
  • After minification 389.6 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. Skolaon Line images are well optimized though.

JavaScript Optimization

-81%

Potential reduce by 836.7 kB

  • Original 1.0 MB
  • After minification 702.4 kB
  • After compression 195.3 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 836.7 kB or 81% of the original size.

CSS Optimization

-88%

Potential reduce by 148.4 kB

  • Original 168.0 kB
  • After minification 102.5 kB
  • After compression 19.6 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. Skolaonline.cz needs all CSS files to be minified and compressed as it can save up to 148.4 kB or 88% of the original size.

Requests Breakdown

Number of requests can be reduced by 18 (45%)

Requests Now

40

After Optimization

22

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 40 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Skolaon Line. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

skolaonline.cz

skolaonline.cz

420 ms

default.css

default.css

554 ms

SearchSkinObjectPreview.css

SearchSkinObjectPreview.css

259 ms

skin.css

skin.css

387 ms

container.css

container.css

259 ms

container.css

container.css

260 ms

jquery.js

jquery.js

647 ms

jquery-migrate.js

jquery-migrate.js

527 ms

jquery-ui.js

jquery-ui.js

1581 ms

WebResource.axd

WebResource.axd

528 ms

Telerik.Web.UI.WebResource.axd

Telerik.Web.UI.WebResource.axd

1637 ms

dnn.js

dnn.js

796 ms

dnn.modalpopup.js

dnn.modalpopup.js

796 ms

dnn.servicesframework.js

dnn.servicesframework.js

808 ms

SearchSkinObjectPreview.js

SearchSkinObjectPreview.js

904 ms

dnncore.js

dnncore.js

1070 ms

slides.min.jquery.js

slides.min.jquery.js

1063 ms

cookieconsent.min.js

cookieconsent.min.js

7 ms

initWidgets.js

initWidgets.js

1082 ms

ga.js

ga.js

64 ms

header-logo.png

header-logo.png

274 ms

banner1.jpg

banner1.jpg

515 ms

banner2.jpg

banner2.jpg

784 ms

banner3.jpg

banner3.jpg

657 ms

banner4.jpg

banner4.jpg

785 ms

banner5.jpg

banner5.jpg

912 ms

button-vstup.png

button-vstup.png

542 ms

button-vyzkousejte-zdarma.png

button-vyzkousejte-zdarma.png

774 ms

icon-phone.png

icon-phone.png

811 ms

icon-email.png

icon-email.png

916 ms

icon-form.png

icon-form.png

1044 ms

icon-search.png

icon-search.png

1028 ms

__utm.gif

__utm.gif

82 ms

left-arrow.png

left-arrow.png

1002 ms

right-arrow.png

right-arrow.png

1038 ms

background-contact.png

background-contact.png

1128 ms

DotNetNukeAjaxShared.js

DotNetNukeAjaxShared.js

1668 ms

banner1.jpg

banner1.jpg

1752 ms

loading.gif

loading.gif

1261 ms

pagination.png

pagination.png

1253 ms

dark-bottom.css

dark-bottom.css

8 ms

Accessibility Review

skolaonline.cz accessibility score

96

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

Links do not have a discernible name

Best Practices

skolaonline.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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

skolaonline.cz SEO score

67

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

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 Skolaonline.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 Skolaonline.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

skolaonline.cz

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