Tools & Wizards About Us
techbooks.cz screenshot

Report Summary

  • 40

    Performance

    Renders faster than
    59% of other websites

  • 76

    Accessibility

    Visual factors better than
    that of 42% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 62

    SEO

    Google-friendlier than
    23% of websites

techbooks.cz

TechBooks.cz

Page Load Speed

7.2 sec in total

First Response

384 ms

Resources Loaded

5.5 sec

Page Rendered

1.3 sec

techbooks.cz screenshot

About Website

Welcome to techbooks.cz homepage info - get ready to check Tech Books best content right away, or after learning these important things about techbooks.cz

největší nabídka technické literatury, servisní manuály, dílenské příručky, uživatelské manuály, monografie, technická literatura, obrazová literatura, automobily, motocykly, lodě, letadla, železnice

Visit techbooks.cz

Key Findings

We analyzed Techbooks.cz page load time and found that the first response time was 384 ms and then it took 6.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

techbooks.cz performance score

40

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.9 s

10/100

10%

LCP (Largest Contentful Paint)

Value8.6 s

1/100

25%

SI (Speed Index)

Value8.9 s

15/100

10%

TBT (Total Blocking Time)

Value340 ms

74/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value27.5 s

0/100

10%

Network Requests Diagram

techbooks.cz

384 ms

techbooks.cz

391 ms

www.techbooks.cz

1036 ms

jquery.min.js

46 ms

jquery-ui.min.js

39 ms

Our browser made a total of 200 requests to load all elements on the main page. We found that 93% of them (185 requests) were addressed to the original Techbooks.cz, 2% (4 requests) were made to Platform.twitter.com and 1% (2 requests) were made to Piwik.webareal.cz. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Techbooks.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.4 MB (11%)

Content Size

21.0 MB

After Optimization

18.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Techbooks.cz main page is 21.0 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 20.6 MB which makes up the majority of the site volume.

HTML Optimization

-90%

Potential reduce by 198.5 kB

  • Original 219.8 kB
  • After minification 180.2 kB
  • After compression 21.4 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 39.6 kB, which is 18% 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 198.5 kB or 90% of the original size.

Image Optimization

-10%

Potential reduce by 2.1 MB

  • Original 20.6 MB
  • After minification 18.5 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. Tech Books images are well optimized though.

JavaScript Optimization

-14%

Potential reduce by 25.9 kB

  • Original 179.1 kB
  • After minification 178.8 kB
  • After compression 153.2 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 25.9 kB or 14% of the original size.

CSS Optimization

-16%

Potential reduce by 4.1 kB

  • Original 26.0 kB
  • After minification 25.8 kB
  • After compression 21.9 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. Techbooks.cz needs all CSS files to be minified and compressed as it can save up to 4.1 kB or 16% of the original size.

Requests Breakdown

Number of requests can be reduced by 41 (21%)

Requests Now

197

After Optimization

156

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 197 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Tech Books. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 32 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

techbooks.cz

techbooks.cz

384 ms

techbooks.cz

techbooks.cz

391 ms

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1036 ms

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Accessibility Review

techbooks.cz accessibility score

76

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

techbooks.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

SEO Factors

techbooks.cz SEO score

62

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

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 Techbooks.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 Techbooks.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

techbooks.cz

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