Tools & Wizards About Us
vda.cz screenshot

Report Summary

  • 36

    Performance

    Renders faster than
    55% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

vda.cz

Střední škola technická a dopravní Gustava Habrmana Česká Třebová

Page Load Speed

4 sec in total

First Response

365 ms

Resources Loaded

3.4 sec

Page Rendered

267 ms

vda.cz screenshot

About Website

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

Vzděláváme v oblasti elektrotechniky, informačních technologií, dopravy, strojírenství, nábytkářství. Pokračujeme v dlouholeté tradici odborného vzdělávání. Zjistěte o nás více.

Visit vda.cz

Key Findings

We analyzed Vda.cz page load time and found that the first response time was 365 ms and then it took 3.6 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

vda.cz performance score

36

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.4 s

7/100

10%

LCP (Largest Contentful Paint)

Value9.3 s

1/100

25%

SI (Speed Index)

Value7.6 s

26/100

10%

TBT (Total Blocking Time)

Value490 ms

59/100

30%

CLS (Cumulative Layout Shift)

Value0.137

79/100

15%

TTI (Time to Interactive)

Value9.7 s

29/100

10%

Network Requests Diagram

vda.cz

365 ms

www.vda.cz

506 ms

jquery.js

251 ms

lightbox.js

275 ms

jwplayer.js

419 ms

Our browser made a total of 75 requests to load all elements on the main page. We found that 97% of them (73 requests) were addressed to the original Vda.cz, 3% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.3 sec) belongs to the original domain Vda.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 385.9 kB (21%)

Content Size

1.9 MB

After Optimization

1.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vda.cz main page is 1.9 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 1.5 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 25.4 kB

  • Original 30.3 kB
  • After minification 29.9 kB
  • After compression 4.9 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 25.4 kB or 84% of the original size.

Image Optimization

-9%

Potential reduce by 136.4 kB

  • Original 1.5 MB
  • After minification 1.4 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. Vda images are well optimized though.

JavaScript Optimization

-67%

Potential reduce by 210.3 kB

  • Original 312.8 kB
  • After minification 298.3 kB
  • After compression 102.5 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 210.3 kB or 67% of the original size.

CSS Optimization

-77%

Potential reduce by 13.7 kB

  • Original 17.8 kB
  • After minification 13.5 kB
  • After compression 4.1 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. Vda.cz needs all CSS files to be minified and compressed as it can save up to 13.7 kB or 77% of the original size.

Requests Breakdown

Number of requests can be reduced by 10 (14%)

Requests Now

71

After Optimization

61

  • Images
  • JavaScript
  • CSS

The browser has sent 71 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vda. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

vda.cz

vda.cz

365 ms

www.vda.cz

www.vda.cz

506 ms

jquery.js

jquery.js

251 ms

lightbox.js

lightbox.js

275 ms

jwplayer.js

jwplayer.js

419 ms

dropdown.css

dropdown.css

281 ms

infiniteCarousel.css

infiniteCarousel.css

319 ms

jquery.bxslider.min.js

jquery.bxslider.min.js

332 ms

jquery.corner.js

jquery.corner.js

371 ms

func.js

func.js

401 ms

styly.css

styly.css

509 ms

lightbox.css

lightbox.css

510 ms

ga.js

ga.js

79 ms

logo.png

logo.png

122 ms

slider-66-thumb.jpg

slider-66-thumb.jpg

287 ms

slider-68-thumb.jpg

slider-68-thumb.jpg

406 ms

slider-51-thumb.jpg

slider-51-thumb.jpg

424 ms

slider-67-thumb.jpg

slider-67-thumb.jpg

455 ms

slider-45-thumb.jpg

slider-45-thumb.jpg

661 ms

slider-62-thumb.jpg

slider-62-thumb.jpg

361 ms

slider-53-thumb.jpg

slider-53-thumb.jpg

434 ms

slider-14-thumb.jpg

slider-14-thumb.jpg

602 ms

slider-13-thumb.jpg

slider-13-thumb.jpg

542 ms

slider-64-thumb.jpg

slider-64-thumb.jpg

713 ms

slider-57-thumb.jpg

slider-57-thumb.jpg

579 ms

slider-65-thumb.jpg

slider-65-thumb.jpg

744 ms

slider-52-thumb.jpg

slider-52-thumb.jpg

675 ms

slider-71-thumb.jpg

slider-71-thumb.jpg

727 ms

slider-61-thumb.jpg

slider-61-thumb.jpg

723 ms

slider-63-thumb.jpg

slider-63-thumb.jpg

1089 ms

slider-28-thumb.jpg

slider-28-thumb.jpg

808 ms

ban-35.png

ban-35.png

861 ms

ban-34.png

ban-34.png

844 ms

ban-33.png

ban-33.png

878 ms

ban-32.png

ban-32.png

885 ms

ban-30.png

ban-30.png

944 ms

ban-27.png

ban-27.png

967 ms

ban-26.png

ban-26.png

1012 ms

ban-25.png

ban-25.png

1033 ms

ban-24.png

ban-24.png

1032 ms

ban-23.png

ban-23.png

1076 ms

ban-21.png

ban-21.png

1088 ms

ban-19.png

ban-19.png

1165 ms

ban-18.png

ban-18.png

1171 ms

ban-17.png

ban-17.png

1188 ms

ban-16.png

ban-16.png

1209 ms

ban-14.png

ban-14.png

1228 ms

ban-12.png

ban-12.png

1206 ms

__utm.gif

__utm.gif

14 ms

opvk2.jpg

opvk2.jpg

1281 ms

zrizovatelskoly.jpg

zrizovatelskoly.jpg

1194 ms

znakpk1.jpg

znakpk1.jpg

1057 ms

klickevzdelani-30.jpg

klickevzdelani-30.jpg

974 ms

facebook.png

facebook.png

943 ms

menu.png

menu.png

956 ms

submenu_top.png

submenu_top.png

1024 ms

submenu_mid.png

submenu_mid.png

1016 ms

submenu_down.png

submenu_down.png

915 ms

textbox_mid.png

textbox_mid.png

898 ms

bx_loader.gif

bx_loader.gif

905 ms

left.gif

left.gif

863 ms

right.gif

right.gif

903 ms

controls.png

controls.png

887 ms

background.jpg

background.jpg

1045 ms

lupa.png

lupa.png

882 ms

letter.png

letter.png

917 ms

tisk.png

tisk.png

860 ms

textbox_top.png

textbox_top.png

855 ms

textbox_down.png

textbox_down.png

879 ms

menu_down1.png

menu_down1.png

860 ms

li.png

li.png

917 ms

menu_down2.png

menu_down2.png

872 ms

menu_down3.png

menu_down3.png

854 ms

footer.png

footer.png

854 ms

print.css

print.css

125 ms

Accessibility Review

vda.cz accessibility score

96

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

Links do not have a discernible name

Best Practices

vda.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

vda.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

    CS

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Vda.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 Vda.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

vda.cz

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