Tools & Wizards About Us
coollib.net screenshot

Report Summary

  • 73

    Performance

    Renders faster than
    82% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 97% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 97

    SEO

    Google-friendlier than
    91% of websites

coollib.net

КулЛиб - Классная библиотека, скачать книги, читать онлайн fb2

Page Load Speed

2.9 sec in total

First Response

165 ms

Resources Loaded

2 sec

Page Rendered

787 ms

coollib.net screenshot

About Website

Visit coollib.net now to see the best up-to-date Coollib content for Russia and also check out these interesting facts you probably never knew about coollib.net

CoolLib ( КулЛиб ) - Классная библиотека! Много книг. Все книги можно скачать и прочитать бесплатно и без регистрации. Самиздат (СИ). Любительский перевод (ЛП). Фанфики, бестселлеры, топ книг. Читать ...

Visit coollib.net

Key Findings

We analyzed Coollib.net page load time and found that the first response time was 165 ms and then it took 2.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

coollib.net performance score

73

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

66/100

10%

LCP (Largest Contentful Paint)

Value2.6 s

88/100

25%

SI (Speed Index)

Value3.5 s

88/100

10%

TBT (Total Blocking Time)

Value560 ms

53/100

30%

CLS (Cumulative Layout Shift)

Value0.051

99/100

15%

TTI (Time to Interactive)

Value7.5 s

47/100

10%

Network Requests Diagram

coollib.net

165 ms

coollib.net

649 ms

css_8d7ab128af7f677dbe234fab35a05a9d.css

312 ms

js_e7e1a2f09fc0f2920fbb39255582819a.js

316 ms

context.js

893 ms

Our browser made a total of 30 requests to load all elements on the main page. We found that 87% of them (26 requests) were addressed to the original Coollib.net, 3% (1 request) were made to Yandex.ru and 3% (1 request) were made to Cdn.tds.bid. The less responsive or slowest element that took the longest time to load (893 ms) relates to the external source Yandex.ru.

Page Optimization Overview & Recommendations

Page size can be reduced by 88.4 kB (20%)

Content Size

434.5 kB

After Optimization

346.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Coollib.net main page is 434.5 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. 25% of websites need less resources to load. Images take 207.9 kB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 77.4 kB

  • Original 104.5 kB
  • After minification 103.9 kB
  • After compression 27.1 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. 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 77.4 kB or 74% of the original size.

Image Optimization

-4%

Potential reduce by 7.6 kB

  • Original 207.9 kB
  • After minification 200.3 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. Coollib images are well optimized though.

JavaScript Optimization

-3%

Potential reduce by 2.9 kB

  • Original 107.3 kB
  • After minification 107.3 kB
  • After compression 104.3 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

-3%

Potential reduce by 481 B

  • Original 14.8 kB
  • After minification 14.8 kB
  • After compression 14.3 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. Coollib.net has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 4 (14%)

Requests Now

28

After Optimization

24

  • Images
  • JavaScript
  • CSS

The browser has sent 28 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Coollib. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

coollib.net

coollib.net

165 ms

coollib.net

coollib.net

649 ms

css_8d7ab128af7f677dbe234fab35a05a9d.css

css_8d7ab128af7f677dbe234fab35a05a9d.css

312 ms

js_e7e1a2f09fc0f2920fbb39255582819a.js

js_e7e1a2f09fc0f2920fbb39255582819a.js

316 ms

context.js

context.js

893 ms

bid.js

bid.js

43 ms

js

js

54 ms

tag.js

tag.js

786 ms

login-bg.png

login-bg.png

208 ms

t560242.jpg

t560242.jpg

94 ms

picture-3.jpg

picture-3.jpg

93 ms

88x31.jpg

88x31.jpg

153 ms

230x31.jpg

230x31.jpg

162 ms

book-banner.gif

book-banner.gif

319 ms

picture-1383.png

picture-1383.png

302 ms

t725085.jpg

t725085.jpg

228 ms

t725082.jpg

t725082.jpg

241 ms

t725013.jpg

t725013.jpg

254 ms

t725154.jpg

t725154.jpg

297 ms

t725119.jpg

t725119.jpg

321 ms

t725114.jpg

t725114.jpg

329 ms

t725118.jpg

t725118.jpg

346 ms

t725088.jpg

t725088.jpg

383 ms

t725089.jpg

t725089.jpg

388 ms

t725105.jpg

t725105.jpg

411 ms

t725217.jpg

t725217.jpg

413 ms

t725145.jpg

t725145.jpg

421 ms

t725092.jpg

t725092.jpg

439 ms

t725094.jpg

t725094.jpg

460 ms

t725172.jpg

t725172.jpg

474 ms

Accessibility Review

coollib.net accessibility score

100

Accessibility Issues

Best Practices

coollib.net best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

coollib.net SEO score

97

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

    RU

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Coollib.net can be misinterpreted by Google and other search engines. Our service has detected that Russian is used on the page, and it does not match the claimed English language. Our system also found out that Coollib.net 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

coollib.net

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