37.1 sec in total
4.4 sec
32.4 sec
358 ms
Welcome to 51book.com homepage info - get ready to check 51 Book best content for China right away, or after learning these important things about 51book.com
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Visit 51book.comWe analyzed 51book.com page load time and found that the first response time was 4.4 sec and then it took 32.7 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.
51book.com performance score
name
value
score
weighting
Value3.0 s
51/100
10%
Value8.2 s
2/100
25%
Value12.9 s
2/100
10%
Value6,340 ms
0/100
30%
Value0.077
95/100
15%
Value15.9 s
6/100
10%
4394 ms
2446 ms
1051 ms
2487 ms
2775 ms
Our browser made a total of 93 requests to load all elements on the main page. We found that 19% of them (18 requests) were addressed to the original 51book.com, 41% (38 requests) were made to Caigou.51book.com and 15% (14 requests) were made to Liantuoyun.com. The less responsive or slowest element that took the longest time to load (20 sec) relates to the external source Qiao.baidu.com.
Page size can be reduced by 311.2 kB (14%)
2.2 MB
1.9 MB
In fact, the total size of 51book.com main page is 2.2 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 1.9 MB which makes up the majority of the site volume.
Potential reduce by 63.5 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 12.8 kB, which is 17% 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 63.5 kB or 83% of the original size.
Potential reduce by 103.9 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. 51 Book images are well optimized though.
Potential reduce by 125.2 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 125.2 kB or 66% of the original size.
Potential reduce by 18.7 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. 51book.com needs all CSS files to be minified and compressed as it can save up to 18.7 kB or 80% of the original size.
Number of requests can be reduced by 33 (36%)
91
58
The browser has sent 91 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 51 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 30 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.
51book.com
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jquery-1.4.4.js
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js-cookie.js
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icon-top.png
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icon-home.png
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reset.css
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common.css
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home.css
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signon.js
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contextPathJs.js
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engine.js
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util.js
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RefundManage.js
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51book-logo-LT.gif
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aio_progress.gif
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jquery-1.7.2.min.js
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PassWordDwr.js
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RefundManage.getNoticeOrNews.dwr
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RefundManage.getAdvertisement.dwr
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RefundManage.getTourismCategorySetting.dwr
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main.css
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fix.css
871 ms
version.js
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1531 ms
51book.com 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-hidden="true"] elements contain focusable descendents
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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
<html> element does not have a [lang] attribute
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
Image elements do not have [alt] attributes
Links do not have a discernible name
51book.com 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
Displays images with incorrect aspect ratio
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
51book.com SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Image elements do not have [alt] attributes
ZH
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 51book.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 51book.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.
51book.com
Open Graph description is not detected on the main page of 51 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: