Tools & Wizards About Us
lanbook.com screenshot

Report Summary

  • 49

    Performance

    Renders faster than
    67% of other websites

  • 78

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

lanbook.com

Издательство Лань - выпуск учебной литературы для вузов

Page Load Speed

2.9 sec in total

First Response

353 ms

Resources Loaded

2 sec

Page Rendered

511 ms

lanbook.com screenshot

About Website

Click here to check amazing Lanbook content for Russia. Otherwise, check out these important facts you probably never knew about lanbook.com

Официальный сайт издательства Лань. Интернет-магазин, аннотированный каталог учебной литературы, каталог авторов, фрагменты текстов, Адреса торговых представительств. Информация для авторов.

Visit lanbook.com

Key Findings

We analyzed Lanbook.com page load time and found that the first response time was 353 ms and then it took 2.5 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

lanbook.com performance score

49

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.9 s

88/100

10%

LCP (Largest Contentful Paint)

Value6.7 s

8/100

25%

SI (Speed Index)

Value5.6 s

54/100

10%

TBT (Total Blocking Time)

Value660 ms

45/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value8.2 s

40/100

10%

Network Requests Diagram

lanbook.com

353 ms

lanbook.com

334 ms

style.css

30 ms

bundle.css

116 ms

core.min.js

161 ms

Our browser made a total of 33 requests to load all elements on the main page. We found that 85% of them (28 requests) were addressed to the original Lanbook.com, 6% (2 requests) were made to Googletagmanager.com and 6% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (899 ms) relates to the external source Mc.yandex.ru.

Page Optimization Overview & Recommendations

Page size can be reduced by 230.0 kB (30%)

Content Size

773.8 kB

After Optimization

543.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Lanbook.com main page is 773.8 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. 35% of websites need less resources to load. Javascripts take 471.0 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 47.0 kB

  • Original 57.0 kB
  • After minification 43.5 kB
  • After compression 9.9 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. This page needs HTML code to be minified as it can gain 13.4 kB, which is 24% 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 47.0 kB or 83% of the original size.

Image Optimization

-8%

Potential reduce by 11.9 kB

  • Original 152.5 kB
  • After minification 140.7 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. Lanbook images are well optimized though.

JavaScript Optimization

-32%

Potential reduce by 152.1 kB

  • Original 471.0 kB
  • After minification 471.0 kB
  • After compression 318.9 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 152.1 kB or 32% of the original size.

CSS Optimization

-20%

Potential reduce by 19.0 kB

  • Original 93.3 kB
  • After minification 93.3 kB
  • After compression 74.3 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. Lanbook.com needs all CSS files to be minified and compressed as it can save up to 19.0 kB or 20% of the original size.

Requests Breakdown

Number of requests can be reduced by 15 (56%)

Requests Now

27

After Optimization

12

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 27 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Lanbook. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

lanbook.com

lanbook.com

353 ms

lanbook.com

lanbook.com

334 ms

style.css

style.css

30 ms

bundle.css

bundle.css

116 ms

core.min.js

core.min.js

161 ms

bundle.js

bundle.js

151 ms

logo.svg

logo.svg

96 ms

logo-mobile.svg

logo-mobile.svg

93 ms

global-f5.png

global-f5.png

99 ms

ebc.png

ebc.png

100 ms

iglk8rr45t7gkk92dtc0gw82kx56i3m9.png

iglk8rr45t7gkk92dtc0gw82kx56i3m9.png

150 ms

wbbki1mamy1rs2vhfu7gkjesprowbkeu.jpg

wbbki1mamy1rs2vhfu7gkjesprowbkeu.jpg

149 ms

preloader-222x315.svg

preloader-222x315.svg

103 ms

preloader-300x225.svg

preloader-300x225.svg

102 ms

opensans-regular.woff

opensans-regular.woff

762 ms

opensans-light.woff

opensans-light.woff

868 ms

opensans-semibold.woff

opensans-semibold.woff

867 ms

opensans-bold.woff

opensans-bold.woff

859 ms

gtm.js

gtm.js

93 ms

1.0b7f3.bundle.js

1.0b7f3.bundle.js

137 ms

analytics.js

analytics.js

37 ms

tag.js

tag.js

899 ms

2.dd2ee.bundle.js

2.dd2ee.bundle.js

34 ms

4.601d9.bundle.js

4.601d9.bundle.js

35 ms

7.80668.bundle.js

7.80668.bundle.js

61 ms

9.c6306.bundle.js

9.c6306.bundle.js

64 ms

10.5cd2c.bundle.js

10.5cd2c.bundle.js

88 ms

11.bc8bd.bundle.js

11.bc8bd.bundle.js

91 ms

25.6500c.bundle.js

25.6500c.bundle.js

168 ms

31.a57ac.bundle.js

31.a57ac.bundle.js

167 ms

32.ace04.bundle.js

32.ace04.bundle.js

167 ms

collect

collect

14 ms

js

js

51 ms

Accessibility Review

lanbook.com accessibility score

78

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

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

lanbook.com best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

lanbook.com SEO score

100

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

Language and Encoding

  • Language Detected

    RU

  • Language Claimed

    RU

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Lanbook.com can be misinterpreted by Google and other search engines. Our service has detected that Russian is used on the page, and it matches the claimed language. Our system also found out that Lanbook.com 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

lanbook.com

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