Tools & Wizards About Us
levny-knihy.cz screenshot

Report Summary

  • 51

    Performance

    Renders faster than
    69% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 76% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 97

    SEO

    Google-friendlier than
    91% of websites

levny-knihy.cz

Obrovský výběr knih, audioknih a e-booku na internetu a levně | Internetové knihkupectví

Page Load Speed

4.5 sec in total

First Response

332 ms

Resources Loaded

3.8 sec

Page Rendered

425 ms

levny-knihy.cz screenshot

About Website

Click here to check amazing Levny Knih Y content. Otherwise, check out these important facts you probably never knew about levny-knihy.cz

Online internetové knihkupectví, které nabízí širokou nabídku nejnovějších titulů, starých klasik a jiných novinek ze světa knih.

Visit levny-knihy.cz

Key Findings

We analyzed Levny-knihy.cz page load time and found that the first response time was 332 ms and then it took 4.2 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

levny-knihy.cz performance score

51

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

34/100

10%

LCP (Largest Contentful Paint)

Value8.6 s

1/100

25%

SI (Speed Index)

Value4.8 s

68/100

10%

TBT (Total Blocking Time)

Value50 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.362

30/100

15%

TTI (Time to Interactive)

Value6.4 s

59/100

10%

Network Requests Diagram

levny-knihy.cz

332 ms

www.levny-knihy.cz

361 ms

www.levny-knihy.cz

617 ms

bootstrap.min.css

118 ms

animate.min.css

229 ms

Our browser made a total of 71 requests to load all elements on the main page. We found that 97% of them (69 requests) were addressed to the original Levny-knihy.cz, 3% (2 requests) were made to Code.jquery.com. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Levny-knihy.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 100.8 kB (3%)

Content Size

2.9 MB

After Optimization

2.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Levny-knihy.cz main page is 2.9 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. 45% of websites need less resources to load. Images take 2.7 MB which makes up the majority of the site volume.

HTML Optimization

-91%

Potential reduce by 84.4 kB

  • Original 92.8 kB
  • After minification 68.1 kB
  • After compression 8.4 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 24.7 kB, which is 27% 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 84.4 kB or 91% of the original size.

Image Optimization

-0%

Potential reduce by 11.9 kB

  • Original 2.7 MB
  • After minification 2.7 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. Levny Knih Y images are well optimized though.

JavaScript Optimization

-3%

Potential reduce by 2.6 kB

  • Original 79.8 kB
  • After minification 79.8 kB
  • After compression 77.2 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. This website has mostly compressed JavaScripts.

CSS Optimization

-4%

Potential reduce by 1.9 kB

  • Original 48.4 kB
  • After minification 48.4 kB
  • After compression 46.5 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. Levny-knihy.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 18 (28%)

Requests Now

65

After Optimization

47

  • Images
  • JavaScript
  • CSS

The browser has sent 65 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Levny Knih Y. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

levny-knihy.cz

levny-knihy.cz

332 ms

www.levny-knihy.cz

www.levny-knihy.cz

361 ms

www.levny-knihy.cz

www.levny-knihy.cz

617 ms

bootstrap.min.css

bootstrap.min.css

118 ms

animate.min.css

animate.min.css

229 ms

font-awesome.min.css

font-awesome.min.css

333 ms

owl.carousel.min.css

owl.carousel.min.css

332 ms

owl.theme.default.min.css

owl.theme.default.min.css

335 ms

materialicons.css

materialicons.css

335 ms

jquery-ui.css

jquery-ui.css

19 ms

style.min.css

style.min.css

335 ms

autocomplete.css

autocomplete.css

339 ms

PagedList.css

PagedList.css

443 ms

jquery.dialog.min.css

jquery.dialog.min.css

442 ms

logo.png

logo.png

442 ms

504710_big.jpg

504710_big.jpg

551 ms

504694_big.jpg

504694_big.jpg

554 ms

505876_big.jpg

505876_big.jpg

507 ms

253186_big.jpg

253186_big.jpg

553 ms

235523_big.jpg

235523_big.jpg

663 ms

175735_big.jpg

175735_big.jpg

553 ms

207932_big.jpg

207932_big.jpg

561 ms

520612_big.jpg

520612_big.jpg

664 ms

141027.gif

141027.gif

775 ms

217205_big.jpg

217205_big.jpg

666 ms

528021_big.jpg

528021_big.jpg

667 ms

jquery-3.2.1.min.js

jquery-3.2.1.min.js

788 ms

jquery-ui.js

jquery-ui.js

20 ms

popper.min.js

popper.min.js

778 ms

bootstrap.min.js

bootstrap.min.js

783 ms

jquery.autocomplete.js

jquery.autocomplete.js

780 ms

cookieconsent.js

cookieconsent.js

885 ms

cookieconsent-init-1.1.js

cookieconsent-init-1.1.js

891 ms

owl.carousel.min.js

owl.carousel.min.js

898 ms

mimity.min.js

mimity.min.js

894 ms

264962_big.jpg

264962_big.jpg

941 ms

proradna-kraska-katee-robert_272550.png

proradna-kraska-katee-robert_272550.png

1014 ms

skryty-potencial-adam-grant_272549.png

skryty-potencial-adam-grant_272549.png

1000 ms

lad-ilona-wisniewska_272548.png

lad-ilona-wisniewska_272548.png

1118 ms

matematicke-cvicenia-pre-deti-8-10-rokov-autor-neuveden_272547.png

matematicke-cvicenia-pre-deti-8-10-rokov-autor-neuveden_272547.png

1230 ms

len-jeden-odtien-zrady-marian-janik_272546.png

len-jeden-odtien-zrady-marian-janik_272546.png

1238 ms

mozaika-duse-tomas-kvapilik_272545.png

mozaika-duse-tomas-kvapilik_272545.png

1131 ms

cesta-rusu-k-valce-petra-prochazkova_272544.png

cesta-rusu-k-valce-petra-prochazkova_272544.png

1241 ms

nevinnosti-martin-svanda_272543.png

nevinnosti-martin-svanda_272543.png

1234 ms

pripady-soudce-ti-jak-zpracovat-podezreleho-a-kachnu-na-medu-frederic-lenormand_272542.png

pripady-soudce-ti-jak-zpracovat-podezreleho-a-kachnu-na-medu-frederic-lenormand_272542.png

1146 ms

elizabeth-taylorova-kate-andersen-browerova_272541.png

elizabeth-taylorova-kate-andersen-browerova_272541.png

1346 ms

az-na-veky-malin-stehn_272540.png

az-na-veky-malin-stehn_272540.png

1567 ms

mastne-kyseliny-a-tuky-ve-zdravi-a-nemoci-miroslav-zeman_272539.png

mastne-kyseliny-a-tuky-ve-zdravi-a-nemoci-miroslav-zeman_272539.png

1246 ms

velke-dobrodruzstvi-pavel-hovez_272538.png

velke-dobrodruzstvi-pavel-hovez_272538.png

1483 ms

vyhlaska-c-4612009-z-z-ku-katastralnemu-zakonu-alzbeta-sisolak-nemethova_272537.png

vyhlaska-c-4612009-z-z-ku-katastralnemu-zakonu-alzbeta-sisolak-nemethova_272537.png

1149 ms

vitejte-na-odysseji-severu-izzy-bromley_272536.png

vitejte-na-odysseji-severu-izzy-bromley_272536.png

1323 ms

tank-pzkpfw-vi-tiger-i-radek-uhlir_272535.png

tank-pzkpfw-vi-tiger-i-radek-uhlir_272535.png

1408 ms

lato-v14-latin_latin-ext-regular.woff

lato-v14-latin_latin-ext-regular.woff

1196 ms

lato-v14-latin_latin-ext-700.woff

lato-v14-latin_latin-ext-700.woff

1240 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

1268 ms

145802_big.jpg

145802_big.jpg

1348 ms

211093_big.jpg

211093_big.jpg

1349 ms

trestny-zakon-tomas-stremy_131597.png

trestny-zakon-tomas-stremy_131597.png

1357 ms

listina-zakladnich-prav-a-svobod-jan-kratochvil_128835.png

listina-zakladnich-prav-a-svobod-jan-kratochvil_128835.png

1350 ms

obchodny-zakonnik-velky-komentar-zvazok-i-olga-oveckova-kniha_114939.png

obchodny-zakonnik-velky-komentar-zvazok-i-olga-oveckova-kniha_114939.png

1350 ms

zakonnik-prace-zakon-o-kolektivnom-vyjednavani-jozef-toman-marek-svec-kniha_113314.png

zakonnik-prace-zakon-o-kolektivnom-vyjednavani-jozef-toman-marek-svec-kniha_113314.png

1349 ms

lucie-david-koller-michal-dvorak-petr-chovanec-robert-kodym-kniha_111620.png

lucie-david-koller-michal-dvorak-petr-chovanec-robert-kodym-kniha_111620.png

1468 ms

vseobecny-slovnik-pravni-autor-neuveden-kniha_93866.png

vseobecny-slovnik-pravni-autor-neuveden-kniha_93866.png

1363 ms

sporove-konanie-pre-kazdeho-ked-sa-uz-sudu-neda-vyhnut-marek-benedik-kniha_77540.png

sporove-konanie-pre-kazdeho-ked-sa-uz-sudu-neda-vyhnut-marek-benedik-kniha_77540.png

1457 ms

anglictina-no-problem-david-gruber-kniha_71725.png

anglictina-no-problem-david-gruber-kniha_71725.png

1348 ms

lou-reed-zivot-anthony-decurtis-kniha_71037.png

lou-reed-zivot-anthony-decurtis-kniha_71037.png

1464 ms

labyrint-sveta-a-raj-srdce-1-2-jan-amos-komensky-kniha_62338.png

labyrint-sveta-a-raj-srdce-1-2-jan-amos-komensky-kniha_62338.png

1649 ms

tajna-valka-spioni-sifry-a-odbojova-hnuti-1939-1945-max-hastings-kniha_51167.png

tajna-valka-spioni-sifry-a-odbojova-hnuti-1939-1945-max-hastings-kniha_51167.png

1357 ms

andy-warhol-gigant-kniha_50129.png

andy-warhol-gigant-kniha_50129.png

1355 ms

patomorfologie-chorob-kosti-a-kloubu-ctibor-povysil-kniha_49673.png

patomorfologie-chorob-kosti-a-kloubu-ctibor-povysil-kniha_49673.png

1353 ms

encyklopedie-knihy-i-iidil-knihtisk-a-pribuzne-obory-v-15-az-19-stoleti-2-svazky-petr-voit-kniha_34022.png

encyklopedie-knihy-i-iidil-knihtisk-a-pribuzne-obory-v-15-az-19-stoleti-2-svazky-petr-voit-kniha_34022.png

1406 ms

Accessibility Review

levny-knihy.cz accessibility score

91

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

Buttons do not have an accessible name

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.

Best Practices

levny-knihy.cz best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

levny-knihy.cz SEO score

97

Search Engine Optimization Advices

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

High

Tap targets are not sized appropriately

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 Levny-knihy.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 Levny-knihy.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

levny-knihy.cz

Open Graph description is not detected on the main page of Levny Knih Y. 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: