Tools & Wizards About Us
knihkup.cz screenshot

Report Summary

  • 38

    Performance

    Renders faster than
    57% 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

knihkup.cz

Velký výběr knih, audioknih a e-booku na internetu | Velký výběr knih online

Page Load Speed

891 ms in total

First Response

303 ms

Resources Loaded

487 ms

Page Rendered

101 ms

knihkup.cz screenshot

About Website

Welcome to knihkup.cz homepage info - get ready to check Knih Kup best content right away, or after learning these important things about knihkup.cz

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

Visit knihkup.cz

Key Findings

We analyzed Knihkup.cz page load time and found that the first response time was 303 ms and then it took 588 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

knihkup.cz performance score

38

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

39/100

10%

LCP (Largest Contentful Paint)

Value14.1 s

0/100

25%

SI (Speed Index)

Value5.6 s

52/100

10%

TBT (Total Blocking Time)

Value300 ms

78/100

30%

CLS (Cumulative Layout Shift)

Value0.549

13/100

15%

TTI (Time to Interactive)

Value9.0 s

34/100

10%

Network Requests Diagram

knihkup.cz

303 ms

test.php

100 ms

analytics.js

5 ms

css

33 ms

adsbygoogle.js

30 ms

Our browser made a total of 8 requests to load all elements on the main page. We found that 25% of them (2 requests) were addressed to the original Knihkup.cz, 25% (2 requests) were made to Google-analytics.com and 25% (2 requests) were made to Pagead2.googlesyndication.com. The less responsive or slowest element that took the longest time to load (303 ms) belongs to the original domain Knihkup.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 336 B (0%)

Content Size

86.8 kB

After Optimization

86.4 kB

  • HTML
  • JavaScript

In fact, the total size of Knihkup.cz main page is 86.8 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. Only 10% of websites need less resources to load. Javascripts take 86.2 kB which makes up the majority of the site volume.

HTML Optimization

-41%

Potential reduce by 223 B

  • Original 540 B
  • After minification 531 B
  • After compression 317 B

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 223 B or 41% of the original size.

JavaScript Optimization

-0%

Potential reduce by 113 B

  • Original 86.2 kB
  • After minification 86.2 kB
  • After compression 86.1 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.

Requests Breakdown

We found no issues to fix!

Requests Now

7

After Optimization

7

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 7 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Knih Kup. According to our analytics all requests are already optimized.

Network Requests Diagram

knihkup.cz

knihkup.cz

303 ms

test.php

test.php

100 ms

analytics.js

analytics.js

5 ms

css

css

33 ms

adsbygoogle.js

adsbygoogle.js

30 ms

collect

collect

20 ms

ca-pub-7234910596589888.js

ca-pub-7234910596589888.js

31 ms

zrt_lookup.html

zrt_lookup.html

35 ms

Accessibility Review

knihkup.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

knihkup.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

knihkup.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 Knihkup.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 Knihkup.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

knihkup.cz

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