Tools & Wizards About Us
levenhuk.cz screenshot

Report Summary

  • 34

    Performance

    Renders faster than
    54% of other websites

  • 73

    Accessibility

    Visual factors better than
    that of 38% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 96

    SEO

    Google-friendlier than
    90% of websites

levenhuk.cz

Oficiální webové stránky Levenhuk pro Českou republiku

Page Load Speed

4.2 sec in total

First Response

372 ms

Resources Loaded

2.6 sec

Page Rendered

1.2 sec

levenhuk.cz screenshot

About Website

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

Oficiální webové stránky Levenhuk pro Českou republiku. Nízké ceny a bonusy. Rychlé doručení. Služby zákazníkům. Vysoce kvalitní výrobky.

Visit levenhuk.cz

Key Findings

We analyzed Levenhuk.cz page load time and found that the first response time was 372 ms and then it took 3.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

levenhuk.cz performance score

34

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

32/100

10%

LCP (Largest Contentful Paint)

Value4.7 s

32/100

25%

SI (Speed Index)

Value6.6 s

37/100

10%

TBT (Total Blocking Time)

Value1,730 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.082

94/100

15%

TTI (Time to Interactive)

Value11.0 s

20/100

10%

Network Requests Diagram

levenhuk.cz

372 ms

levenhuk.cz

370 ms

cz.levenhuk.com

768 ms

ui.design-tokens.min.css

185 ms

ui.font.opensans.min.css

268 ms

Our browser made a total of 22 requests to load all elements on the main page. We found that 9% of them (2 requests) were addressed to the original Levenhuk.cz, 77% (17 requests) were made to Cz.levenhuk.com and 5% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (888 ms) relates to the external source Cz.levenhuk.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 415.1 kB (49%)

Content Size

848.4 kB

After Optimization

433.3 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Levenhuk.cz main page is 848.4 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 20% of websites need less resources to load. Javascripts take 362.3 kB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 317.9 kB

  • Original 360.8 kB
  • After minification 336.8 kB
  • After compression 42.9 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 317.9 kB or 88% of the original size.

JavaScript Optimization

-18%

Potential reduce by 65.1 kB

  • Original 362.3 kB
  • After minification 362.3 kB
  • After compression 297.2 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 65.1 kB or 18% of the original size.

CSS Optimization

-26%

Potential reduce by 32.0 kB

  • Original 125.2 kB
  • After minification 125.2 kB
  • After compression 93.2 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. Levenhuk.cz needs all CSS files to be minified and compressed as it can save up to 32.0 kB or 26% of the original size.

Requests Breakdown

Number of requests can be reduced by 13 (76%)

Requests Now

17

After Optimization

4

  • Images
  • JavaScript
  • CSS

The browser has sent 17 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Levenhuk. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

levenhuk.cz

levenhuk.cz

372 ms

levenhuk.cz

levenhuk.cz

370 ms

cz.levenhuk.com

cz.levenhuk.com

768 ms

ui.design-tokens.min.css

ui.design-tokens.min.css

185 ms

ui.font.opensans.min.css

ui.font.opensans.min.css

268 ms

main.popup.bundle.min.css

main.popup.bundle.min.css

269 ms

template_281caf6d4f026ee71d713cfb44a7d530_v1.css

template_281caf6d4f026ee71d713cfb44a7d530_v1.css

538 ms

core.min.js

core.min.js

455 ms

kernel_main_v1.js

kernel_main_v1.js

275 ms

dynamic.min.js

dynamic.min.js

276 ms

auto_set_filter_h1.js

auto_set_filter_h1.js

353 ms

main.popup.bundle.min.js

main.popup.bundle.min.js

444 ms

currency-core.bundle.min.js

currency-core.bundle.min.js

368 ms

core_currency.min.js

core_currency.min.js

367 ms

template_ed7edcb8ffef7e5fed7c88700bff45f4_v1.js

template_ed7edcb8ffef7e5fed7c88700bff45f4_v1.js

888 ms

page_435e2eb660a7b6dd4fb8a0dabefa02c0_v1.js

page_435e2eb660a7b6dd4fb8a0dabefa02c0_v1.js

458 ms

js

js

71 ms

logo.svg

logo.svg

94 ms

main_b2b_1440x700_1_1440_700509047ab4411a4e8b9c5da2ae2762b2e.webp

main_b2b_1440x700_1_1440_700509047ab4411a4e8b9c5da2ae2762b2e.webp

178 ms

fi.woff

fi.woff

91 ms

PAJJhLM6sSoWKfWCAAwDAjgbRAAB42mNgYGBkAIIbCZo5IPrmUn0hGA0AO8EFTQAA

PAJJhLM6sSoWKfWCAAwDAjgbRAAB42mNgYGBkAIIbCZo5IPrmUn0hGA0AO8EFTQAA

2 ms

ba.js

ba.js

274 ms

Accessibility Review

levenhuk.cz accessibility score

73

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

[role]s are not contained by their required parent element

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

High

Links do not have a discernible 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.

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

Best Practices

levenhuk.cz best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

levenhuk.cz SEO score

96

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

    N/A

  • Encoding

    UTF-8

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

levenhuk.cz

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