Tools & Wizards About Us
docentbook.com screenshot

Report Summary

  • 17

    Performance

    Renders faster than
    32% of other websites

  • 46

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 91

    SEO

    Google-friendlier than
    70% of websites

docentbook.com

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Page Load Speed

6.4 sec in total

First Response

1.2 sec

Resources Loaded

4.8 sec

Page Rendered

400 ms

docentbook.com screenshot

About Website

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Key Findings

We analyzed Docentbook.com page load time and found that the first response time was 1.2 sec and then it took 5.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

docentbook.com performance score

17

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.7 s

29/100

10%

LCP (Largest Contentful Paint)

Value6.2 s

11/100

25%

SI (Speed Index)

Value7.7 s

24/100

10%

TBT (Total Blocking Time)

Value3,130 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.349

32/100

15%

TTI (Time to Interactive)

Value8.7 s

36/100

10%

Network Requests Diagram

docentbook.com

1220 ms

tz.js

701 ms

bootstrap.min.css

1088 ms

bootstrap-theme.min.css

660 ms

puyuan.css

670 ms

Our browser made a total of 46 requests to load all elements on the main page. We found that 78% of them (36 requests) were addressed to the original Docentbook.com, 20% (9 requests) were made to Jlyhr.com and 2% (1 request) were made to Ek.wherbx.com. The less responsive or slowest element that took the longest time to load (2.6 sec) relates to the external source Jlyhr.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 241.4 kB (16%)

Content Size

1.5 MB

After Optimization

1.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Docentbook.com main page is 1.5 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. 30% of websites need less resources to load. Images take 1.4 MB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 22.4 kB

  • Original 29.1 kB
  • After minification 25.8 kB
  • After compression 6.8 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. This page needs HTML code to be minified as it can gain 3.3 kB, which is 11% 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 22.4 kB or 77% of the original size.

Image Optimization

-13%

Potential reduce by 183.1 kB

  • Original 1.4 MB
  • After minification 1.2 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. Obviously, Docentbook needs image optimization as it can save up to 183.1 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-26%

Potential reduce by 16.6 kB

  • Original 63.9 kB
  • After minification 63.6 kB
  • After compression 47.3 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 16.6 kB or 26% of the original size.

CSS Optimization

-36%

Potential reduce by 19.3 kB

  • Original 53.1 kB
  • After minification 53.1 kB
  • After compression 33.8 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. Docentbook.com needs all CSS files to be minified and compressed as it can save up to 19.3 kB or 36% of the original size.

Requests Breakdown

Number of requests can be reduced by 10 (23%)

Requests Now

44

After Optimization

34

  • Images
  • JavaScript
  • CSS

The browser has sent 44 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Docentbook. 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 from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

docentbook.com

docentbook.com

1220 ms

tz.js

tz.js

701 ms

bootstrap.min.css

bootstrap.min.css

1088 ms

bootstrap-theme.min.css

bootstrap-theme.min.css

660 ms

puyuan.css

puyuan.css

670 ms

puyuan_mob.css

puyuan_mob.css

673 ms

jquery.min.js

jquery.min.js

1374 ms

msclass.js

msclass.js

662 ms

jquery.hislider.js

jquery.hislider.js

881 ms

jquery.hislider.css

jquery.hislider.css

885 ms

owl.carousel.css

owl.carousel.css

893 ms

owl.theme.css

owl.theme.css

897 ms

owl.carousel.js

owl.carousel.js

1320 ms

swt.js

swt.js

665 ms

logo.jpg

logo.jpg

1099 ms

27131521587.jpg

27131521587.jpg

2555 ms

banner2.jpg

banner2.jpg

1518 ms

sy_ban2.jpg

sy_ban2.jpg

2595 ms

t_301053472.jpg

t_301053472.jpg

1090 ms

23114421485.jpg

23114421485.jpg

1101 ms

nanf.jpg

nanf.jpg

1526 ms

zfs.jpg

zfs.jpg

1317 ms

top_bj.png

top_bj.png

228 ms

nav_bj.png

nav_bj.png

223 ms

nav_on.png

nav_on.png

226 ms

sy_a1.png

sy_a1.png

450 ms

sy_a2.png

sy_a2.png

914 ms

sy_a3.png

sy_a3.png

223 ms

sy_a4.png

sy_a4.png

441 ms

sy_a5.png

sy_a5.png

443 ms

nopic.gif

nopic.gif

890 ms

jzzl_pic.jpg

jzzl_pic.jpg

447 ms

jkjy_pic.jpg

jkjy_pic.jpg

654 ms

mtlj_pic.jpg

mtlj_pic.jpg

658 ms

spjj_pic.jpg

spjj_pic.jpg

670 ms

sy__jt1.png

sy__jt1.png

637 ms

sy_tt.png

sy_tt.png

834 ms

esy_30.png

esy_30.png

842 ms

esy2_03.jpg

esy2_03.jpg

856 ms

sy_jt2.png

sy_jt2.png

860 ms

sy_b1.png

sy_b1.png

1050 ms

e79_03.png

e79_03.png

1060 ms

sy_b2.png

sy_b2.png

1074 ms

sy_b3.png

sy_b3.png

1078 ms

sy_b4.png

sy_b4.png

1082 ms

zj_23.png

zj_23.png

1016 ms

Accessibility Review

docentbook.com accessibility score

46

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

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

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

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

docentbook.com 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

SEO Factors

docentbook.com SEO score

91

Search Engine Optimization Advices

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

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

    ZH

  • Language Claimed

    N/A

  • Encoding

    UTF-8

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

docentbook.com

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