Tools & Wizards About Us

Report Summary

  • 19

    Performance

    Renders faster than
    36% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 77

    SEO

    Google-friendlier than
    36% of websites

knihyprodeti.cz

Slovart - knihy moderního člověka

Page Load Speed

5.7 sec in total

First Response

1 sec

Resources Loaded

4.4 sec

Page Rendered

278 ms

About Website

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Slovart - knihy moderního člověka

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Key Findings

We analyzed Knihyprodeti.cz page load time and found that the first response time was 1 sec and then it took 4.7 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

knihyprodeti.cz performance score

19

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.4 s

7/100

10%

LCP (Largest Contentful Paint)

Value9.0 s

1/100

25%

SI (Speed Index)

Value10.9 s

6/100

10%

TBT (Total Blocking Time)

Value3,320 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.065

97/100

15%

TTI (Time to Interactive)

Value11.0 s

21/100

10%

Network Requests Diagram

knihyprodeti.cz

1035 ms

screen.css

344 ms

style.css

467 ms

jquery-1.5.1.min.js

795 ms

jquery.unobtrusive-ajax.js

369 ms

Our browser made a total of 45 requests to load all elements on the main page. We found that all of those requests were addressed to Knihyprodeti.cz and no external sources were called. The less responsive or slowest element that took the longest time to load (2.9 sec) belongs to the original domain Knihyprodeti.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 276.2 kB (33%)

Content Size

834.1 kB

After Optimization

557.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Knihyprodeti.cz main page is 834.1 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. 40% of websites need less resources to load. Images take 620.2 kB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 24.4 kB

  • Original 27.5 kB
  • After minification 19.4 kB
  • After compression 3.1 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. This page needs HTML code to be minified as it can gain 8.1 kB, which is 29% 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 24.4 kB or 89% of the original size.

Image Optimization

-19%

Potential reduce by 117.6 kB

  • Original 620.2 kB
  • After minification 502.6 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. Obviously, Knihy Prodeti needs image optimization as it can save up to 117.6 kB or 19% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-72%

Potential reduce by 120.9 kB

  • Original 168.6 kB
  • After minification 145.1 kB
  • After compression 47.7 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 120.9 kB or 72% of the original size.

CSS Optimization

-75%

Potential reduce by 13.3 kB

  • Original 17.8 kB
  • After minification 15.5 kB
  • After compression 4.5 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. Knihyprodeti.cz needs all CSS files to be minified and compressed as it can save up to 13.3 kB or 75% of the original size.

Requests Breakdown

Number of requests can be reduced by 6 (14%)

Requests Now

44

After Optimization

38

  • Images
  • JavaScript
  • CSS

The browser has sent 44 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Knihy Prodeti. 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 as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

knihyprodeti.cz accessibility score

82

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

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

knihyprodeti.cz best practices score

50

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

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

knihyprodeti.cz SEO score

77

Search Engine Optimization Advices

Language and Encoding

  • Language Detected

    SK

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Knihyprodeti.cz can be misinterpreted by Google and other search engines. Our service has detected that Slovak 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 Knihyprodeti.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

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