Tools & Wizards About Us

Report Summary

  • 60

    Performance

    Renders faster than
    76% of other websites

  • 48

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 54

    SEO

    Google-friendlier than
    19% of websites

sciencenet.cn

科学网—构建全球华人科学社区

Page Load Speed

26.2 sec in total

First Response

1.2 sec

Resources Loaded

24.7 sec

Page Rendered

355 ms

About Website

Visit sciencenet.cn now to see the best up-to-date Sciencenet content for China and also check out these interesting facts you probably never knew about sciencenet.cn

科学网是由中国科学院、中国工程院和国家自然科学基金委员会主管，中国科学报社主办的综合性科学网站，主要为网民提供快捷权威的科学新闻报道、丰富实用的科学信息服务以及交流互动的网络平台，目标是建成最具影响力的全球华人科学社区。

Visit sciencenet.cn

Key Findings

We analyzed Sciencenet.cn page load time and found that the first response time was 1.2 sec and then it took 25 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 was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

sciencenet.cn performance score

60

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

99/100

10%

LCP (Largest Contentful Paint)

Value2.9 s

81/100

25%

SI (Speed Index)

Value6.4 s

40/100

10%

TBT (Total Blocking Time)

Value1,060 ms

25/100

30%

CLS (Cumulative Layout Shift)

Value0.224

56/100

15%

TTI (Time to Interactive)

Value2.6 s

98/100

10%

Network Requests Diagram

sciencenet.cn

1221 ms

css2014.css

487 ms

20244281034369320.jpg

1979 ms

20244251638446130.jpg

3517 ms

2024425839253170.jpg

3000 ms

Our browser made a total of 74 requests to load all elements on the main page. We found that 81% of them (60 requests) were addressed to the original Sciencenet.cn, 8% (6 requests) were made to News.sciencenet.cn and 5% (4 requests) were made to Blog.sciencenet.cn. The less responsive or slowest element that took the longest time to load (19.5 sec) relates to the external source Dcs.conac.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 217.4 kB (9%)

Content Size

2.3 MB

After Optimization

2.1 MB

  • HTML
  • Images
  • CSS

In fact, the total size of Sciencenet.cn main page is 2.3 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. 45% of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 67.1 kB

  • Original 81.0 kB
  • After minification 68.4 kB
  • After compression 13.9 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 12.7 kB, which is 16% 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 67.1 kB or 83% of the original size.

Image Optimization

-7%

Potential reduce by 150.0 kB

  • Original 2.3 MB
  • After minification 2.1 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. Sciencenet images are well optimized though.

CSS Optimization

-15%

Potential reduce by 282 B

  • Original 1.9 kB
  • After minification 1.9 kB
  • After compression 1.7 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. Sciencenet.cn needs all CSS files to be minified and compressed as it can save up to 282 B or 15% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

69

After Optimization

69

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 69 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Sciencenet. According to our analytics all requests are already optimized.

Network Requests Diagram

Accessibility Review

sciencenet.cn accessibility score

48

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

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

Best Practices

sciencenet.cn best practices score

58

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

High

Browser errors were logged to the console

SEO Factors

sciencenet.cn SEO score

54

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

High

robots.txt is not valid

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

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 Sciencenet.cn 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 Sciencenet.cn 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

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