Tools & Wizards About Us

Report Summary

  • 11

    Performance

    Renders faster than
    24% of other websites

  • 79

    Accessibility

    Visual factors better than
    that of 47% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 85

    SEO

    Google-friendlier than
    55% of websites

knihy.tyden.cz

Booktook.cz | online knihkupectví - 90 000 titulů skladem

Page Load Speed

3.9 sec in total

First Response

600 ms

Resources Loaded

2.9 sec

Page Rendered

429 ms

About Website

Visit knihy.tyden.cz now to see the best up-to-date Knihy Tyden content for Czech Republic and also check out these interesting facts you probably never knew about knihy.tyden.cz

Největší knižní e-shop s 15letou historií. Spolehlivá doprava a 90 000 titulů skladem. Nakupujte knihy tam, kde jim rozumějí. Booktook.cz – víc než knihkupectví

Visit knihy.tyden.cz

Key Findings

We analyzed Knihy.tyden.cz page load time and found that the first response time was 600 ms and then it took 3.3 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

knihy.tyden.cz performance score

11

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.1 s

1/100

10%

LCP (Largest Contentful Paint)

Value12.2 s

0/100

25%

SI (Speed Index)

Value9.4 s

12/100

10%

TBT (Total Blocking Time)

Value3,020 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.241

52/100

15%

TTI (Time to Interactive)

Value13.8 s

10/100

10%

Network Requests Diagram

knihy.tyden.cz

600 ms

css

26 ms

jquery.min.js

12 ms

jquery-ui.min.js

18 ms

css.php

555 ms

Our browser made a total of 79 requests to load all elements on the main page. We found that 39% of them (31 requests) were addressed to the original Knihy.tyden.cz, 24% (19 requests) were made to Static.knihy.tyden.cz and 6% (5 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.7 sec) relates to the external source Static.knihy.tyden.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 314.7 kB (26%)

Content Size

1.2 MB

After Optimization

894.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Knihy.tyden.cz main page is 1.2 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. 50% of websites need less resources to load. Images take 851.3 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 52.4 kB

  • Original 65.3 kB
  • After minification 58.6 kB
  • After compression 12.9 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 52.4 kB or 80% of the original size.

Image Optimization

-8%

Potential reduce by 64.6 kB

  • Original 851.3 kB
  • After minification 786.7 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. Knihy Tyden images are well optimized though.

JavaScript Optimization

-61%

Potential reduce by 118.8 kB

  • Original 193.9 kB
  • After minification 192.8 kB
  • After compression 75.1 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 118.8 kB or 61% of the original size.

CSS Optimization

-80%

Potential reduce by 78.9 kB

  • Original 98.7 kB
  • After minification 96.6 kB
  • After compression 19.7 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. Knihy.tyden.cz needs all CSS files to be minified and compressed as it can save up to 78.9 kB or 80% of the original size.

Requests Breakdown

Number of requests can be reduced by 35 (46%)

Requests Now

76

After Optimization

41

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 76 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Knihy Tyden. 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 as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

knihy.tyden.cz accessibility score

79

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

ARIA input fields do not have accessible names

High

ARIA toggle fields do not have accessible names

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

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

knihy.tyden.cz best practices score

67

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

knihy.tyden.cz SEO score

85

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

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

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