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book.51cto.com screenshot

Report Summary

  • 0

    Performance

  • 0

    Accessibility

  • 0

    Best Practices

  • 0

    SEO

book.51cto.com

读书频道-IT技术图书-51CTO.COM

Page Load Speed

34.7 sec in total

First Response

3.2 sec

Resources Loaded

31.2 sec

Page Rendered

357 ms

book.51cto.com screenshot

About Website

Welcome to book.51cto.com homepage info - get ready to check Book 51CTO best content for China right away, or after learning these important things about book.51cto.com

51CTO读书频道主要提供最新IT技术图书最新资料、精彩章节的试读、著名作者的动态以及最新图书预告等专业服务。千余本技术图书的展示，为您轻松掌握最新技术趋势与购买重磅图书提供重要参考。

Visit book.51cto.com

Key Findings

We analyzed Book.51cto.com page load time and found that the first response time was 3.2 sec and then it took 31.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster. Unfortunately, there were 5 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

book.51cto.com performance score

0

Network Requests Diagram

book.51cto.com

3209 ms

readbook.css

2763 ms

art_master_top.css

2422 ms

css.css

2423 ms

index_1_down.js

2413 ms

Our browser made a total of 114 requests to load all elements on the main page. We found that 2% of them (2 requests) were addressed to the original Book.51cto.com, 32% (37 requests) were made to Images.51cto.com and 8% (9 requests) were made to S1.51cto.com. The less responsive or slowest element that took the longest time to load (19.9 sec) relates to the external source S2.51cto.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 473.8 kB (40%)

Content Size

1.2 MB

After Optimization

698.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Book.51cto.com main page is 1.2 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 584.1 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 60.1 kB

  • Original 78.3 kB
  • After minification 73.9 kB
  • After compression 18.2 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 60.1 kB or 77% of the original size.

Image Optimization

-15%

Potential reduce by 88.7 kB

  • Original 584.1 kB
  • After minification 495.4 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, Book 51CTO needs image optimization as it can save up to 88.7 kB or 15% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-62%

Potential reduce by 291.2 kB

  • Original 471.1 kB
  • After minification 462.5 kB
  • After compression 179.9 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 291.2 kB or 62% of the original size.

CSS Optimization

-87%

Potential reduce by 33.8 kB

  • Original 38.8 kB
  • After minification 35.4 kB
  • After compression 5.0 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. Book.51cto.com needs all CSS files to be minified and compressed as it can save up to 33.8 kB or 87% of the original size.

Requests Breakdown

Number of requests can be reduced by 42 (40%)

Requests Now

106

After Optimization

64

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 106 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Book 51CTO. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

book.51cto.com

book.51cto.com

3209 ms

readbook.css

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2763 ms

art_master_top.css

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2413 ms

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2138 ms

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783 ms

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13 ms

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490 ms

SEO Factors

book.51cto.com SEO score

0

Language and Encoding

  • Language Detected

    ZH

  • Language Claimed

    N/A

  • Encoding

    GB2312

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Book.51cto.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 Book.51cto.com main page’s claimed encoding is gb2312. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

book.51cto.com

Open Graph description is not detected on the main page of Book 51CTO. 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: