4.1 sec in total
655 ms
3.1 sec
311 ms
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.orgWe analyzed 4book.org page load time and found that the first response time was 655 ms and then it took 3.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.
4book.org performance score
name
value
score
weighting
Value3.8 s
28/100
10%
Value4.5 s
36/100
25%
Value5.3 s
58/100
10%
Value350 ms
72/100
30%
Value0.461
19/100
15%
Value7.5 s
47/100
10%
655 ms
529 ms
246 ms
251 ms
934 ms
Our browser made a total of 54 requests to load all elements on the main page. We found that 37% of them (20 requests) were addressed to the original 4book.org, 22% (12 requests) were made to Vk.com and 9% (5 requests) were made to Pagead2.googlesyndication.com. The less responsive or slowest element that took the longest time to load (934 ms) belongs to the original domain 4book.org.
Page size can be reduced by 504.7 kB (64%)
784.9 kB
280.2 kB
In fact, the total size of 4book.org main page is 784.9 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. Javascripts take 637.2 kB which makes up the majority of the site volume.
Potential reduce by 21.8 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 21.8 kB or 78% of the original size.
Potential reduce by 5.4 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, 4 Book needs image optimization as it can save up to 5.4 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 422.0 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 422.0 kB or 66% of the original size.
Potential reduce by 55.5 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. 4book.org needs all CSS files to be minified and compressed as it can save up to 55.5 kB or 80% of the original size.
Number of requests can be reduced by 32 (60%)
53
21
The browser has sent 53 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 19 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.
4book.org
655 ms
mootools-core.js
529 ms
core.js
246 ms
caption.js
251 ms
mootools-more.js
934 ms
openapi.js
380 ms
screen.css
256 ms
screen.css
253 ms
screen.css
365 ms
template.css
372 ms
template.js
378 ms
ja.cssmenu.js
381 ms
style.css
485 ms
ja.cssmenu.css
495 ms
adsbygoogle.js
4 ms
4book
240 ms
logo.png
172 ms
search.png
202 ms
s.gif
205 ms
s2.gif
205 ms
ca-pub-8876955867825605.js
56 ms
zrt_lookup.html
59 ms
show_ads_impl.js
58 ms
8.png
166 ms
logo_f.png
170 ms
upload.gif
133 ms
widget_community.php
285 ms
ads
266 ms
osd.js
3 ms
print.css
132 ms
loader_nav19130_3.js
163 ms
lite.css
164 ms
lite.js
505 ms
lang3_0.js
252 ms
widget_community.css
253 ms
xdm.js
253 ms
al_community.js
256 ms
m_js_controller.js
27 ms
abg.js
46 ms
01.png
384 ms
googlelogo_color_112x36dp.png
60 ms
nessie_icon_thin_arrow_big_white.png
36 ms
s
22 ms
x_button_blue2.png
10 ms
MdyApZkAHG2-UELdOwjNjjFZXSz-CGj4o1JtDR7aGgs.js
3 ms
cS-wiWigTG4.jpg
405 ms
NVyx-Ni8fRI.jpg
389 ms
-X9nOAwhjKE.jpg
401 ms
sz90YRcD85Q.jpg
384 ms
G0ynH5FqJj0.jpg
393 ms
WWvb9lxG6eY.jpg
401 ms
fSb3D_0G3QM.jpg
389 ms
camera_50.png
130 ms
w_logo.png
136 ms
4book.org accessibility score
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
[aria-*] attributes do not match their roles
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
[id] attributes on active, focusable elements are not unique
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
<frame> or <iframe> elements do not have a title
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
Impact
Issue
<html> element does not have a [lang] attribute
4book.org best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Page has valid source maps
4book.org SEO score
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
Document uses legible font sizes
Tap targets are not sized appropriately
UK
RU
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 it does not match the claimed Russian language. 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.
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: