Tools & Wizards About Us
4book.org screenshot

Report Summary

  • 18

    Performance

    Renders faster than
    34% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 76% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 94

    SEO

    Google-friendlier than
    90% of websites

4book.org

Підручники та ГДЗ, відповіді онлайн, решебники та розв'язники, ДПА | 4book.org

Page Load Speed

3.6 sec in total

First Response

451 ms

Resources Loaded

3 sec

Page Rendered

102 ms

4book.org screenshot

About Website

Welcome to 4book.org homepage info - get ready to check 4 Book best content for Ukraine right away, or after learning these important things about 4book.org

Шкільни підручники ❤, повні ГДЗ (відповіді, решебники, розв'язники) к підручникам та робочим зошитам України ❤. Скачать учебник или смотреть онлайн на телефоне

Visit 4book.org

Key Findings

We analyzed 4book.org page load time and found that the first response time was 451 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

4book.org performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.0 s

24/100

10%

LCP (Largest Contentful Paint)

Value5.2 s

23/100

25%

SI (Speed Index)

Value9.5 s

11/100

10%

TBT (Total Blocking Time)

Value5,160 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.24

52/100

15%

TTI (Time to Interactive)

Value16.7 s

5/100

10%

Network Requests Diagram

4book.org

451 ms

4book.org

399 ms

application-bad4e9b01cb5f5194640a63a1c3da7d90203e3db0f47b605e33787387673f466.css

192 ms

application-f40adec596e628e530dda7c8f272f0ce759e6b0773b810b6b3c2f0f3ce2eed16.js

615 ms

js

79 ms

Our browser made a total of 53 requests to load all elements on the main page. We found that 26% of them (14 requests) were addressed to the original 4book.org, 15% (8 requests) were made to Pagead2.googlesyndication.com and 13% (7 requests) were made to Tpc.googlesyndication.com. The less responsive or slowest element that took the longest time to load (615 ms) belongs to the original domain 4book.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 82.9 kB (11%)

Content Size

776.1 kB

After Optimization

693.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of 4book.org main page is 776.1 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. 60% of websites need less resources to load. Javascripts take 692.6 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 27.3 kB

  • Original 35.0 kB
  • After minification 34.9 kB
  • After compression 7.8 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 27.3 kB or 78% of the original size.

Image Optimization

-6%

Potential reduce by 1.3 kB

  • Original 22.6 kB
  • After minification 21.3 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. 4 Book images are well optimized though.

JavaScript Optimization

-8%

Potential reduce by 54.3 kB

  • Original 692.6 kB
  • After minification 692.6 kB
  • After compression 638.3 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.

CSS Optimization

-0%

Potential reduce by 0 B

  • Original 25.9 kB
  • After minification 25.9 kB
  • After compression 25.9 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. 4book.org has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 20 (45%)

Requests Now

44

After Optimization

24

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 44 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 4 Book. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 21 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

4book.org

4book.org

451 ms

4book.org

4book.org

399 ms

application-bad4e9b01cb5f5194640a63a1c3da7d90203e3db0f47b605e33787387673f466.css

application-bad4e9b01cb5f5194640a63a1c3da7d90203e3db0f47b605e33787387673f466.css

192 ms

application-f40adec596e628e530dda7c8f272f0ce759e6b0773b810b6b3c2f0f3ce2eed16.js

application-f40adec596e628e530dda7c8f272f0ce759e6b0773b810b6b3c2f0f3ce2eed16.js

615 ms

js

js

79 ms

sharethis.js

sharethis.js

26 ms

adsbygoogle.js

adsbygoogle.js

168 ms

css

css

37 ms

analytics.js

analytics.js

89 ms

logo-2a767f7bd52ac049ce03d5b6d6e3a602db4cc2c4a39278841dca8776e523a3f1.png

logo-2a767f7bd52ac049ce03d5b6d6e3a602db4cc2c4a39278841dca8776e523a3f1.png

124 ms

small_inst32.png

small_inst32.png

124 ms

small_face32.png

small_face32.png

212 ms

small_tel32.png

small_tel32.png

212 ms

small_tik32.png

small_tik32.png

306 ms

main_inst32.png

main_inst32.png

308 ms

main_face32.png

main_face32.png

307 ms

main_tel32.png

main_tel32.png

306 ms

main_tik32.png

main_tik32.png

308 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4kaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4kaVc.ttf

93 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0B4kaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0B4kaVc.ttf

139 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1x4kaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1x4kaVc.ttf

141 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4kaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4kaVc.ttf

141 ms

slotcar_library.js

slotcar_library.js

114 ms

show_ads_impl.js

show_ads_impl.js

302 ms

fontawesome-webfont-e3870de89716b72cb61a4bba0e17c75783b361cdaba35ea96961c3070bd8ca18.woff

fontawesome-webfont-e3870de89716b72cb61a4bba0e17c75783b361cdaba35ea96961c3070bd8ca18.woff

407 ms

collect

collect

64 ms

zrt_lookup.html

zrt_lookup.html

35 ms

ads

ads

527 ms

ads

ads

451 ms

ads

ads

300 ms

2c467cbcaed741394c4076d97cdce7d0.js

2c467cbcaed741394c4076d97cdce7d0.js

25 ms

load_preloaded_resource.js

load_preloaded_resource.js

22 ms

ff6b8413ccec2e2686fe44d6d4a2e9d1.js

ff6b8413ccec2e2686fe44d6d4a2e9d1.js

34 ms

abg_lite.js

abg_lite.js

54 ms

window_focus.js

window_focus.js

60 ms

qs_click_protection.js

qs_click_protection.js

88 ms

ufs_web_display.js

ufs_web_display.js

18 ms

b8bba7bdb82ef259240353901c7e809d.js

b8bba7bdb82ef259240353901c7e809d.js

53 ms

icon.png

icon.png

136 ms

s

s

115 ms

reactive_library.js

reactive_library.js

150 ms

ca-pub-8876955867825605

ca-pub-8876955867825605

169 ms

css

css

48 ms

sodar

sodar

140 ms

activeview

activeview

117 ms

bz2hCbE_6V8EgAHmR8QBpY7IEpeHtFZQj3SGg7GDAqk.js

bz2hCbE_6V8EgAHmR8QBpY7IEpeHtFZQj3SGg7GDAqk.js

107 ms

4Ua_rENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RFD48TE63OOYKtrw2IJllpyw.ttf

4Ua_rENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RFD48TE63OOYKtrw2IJllpyw.ttf

80 ms

4Ua_rENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RFD48TE63OOYKtrwEIJllpyw.ttf

4Ua_rENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RFD48TE63OOYKtrwEIJllpyw.ttf

80 ms

feedback_grey600_24dp.png

feedback_grey600_24dp.png

32 ms

fullscreen_api_adapter.js

fullscreen_api_adapter.js

30 ms

interstitial_ad_frame.js

interstitial_ad_frame.js

34 ms

settings_grey600_24dp.png

settings_grey600_24dp.png

28 ms

sodar2.js

sodar2.js

73 ms

Accessibility Review

4book.org accessibility score

91

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

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

4book.org 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

4book.org SEO score

94

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

    UK

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 4book.org can be misinterpreted by Google and other search engines. Our service has detected that Ukrainian 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 4book.org 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

4book.org

Open Graph description is not detected on the main page of 4 Book. 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: