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43 sciencenet.cn Last Updated: 1 year

Success 39% of passed verification steps
Warning 38% of total warning
Errors 23% of total errors, require fast action
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Desktop

Mobile

Performance Desktop Score 74%
Best Practices Desktop Score 54%
SEO Desktop Score 78%
Progressive Web App Desktop Score 31%
Performance Mobile Score 92%
Best Practices Mobile Score 54%
SEO Mobile Score 64%
Progressive Web App Mobile Score 30%
Page Authority Authority 52%
Domain Authority Domain Authority 61%
Moz Rank 5.2/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 19 Characters
科学网—构建全球华人科学社区
Meta Description 110 Characters
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。
Effective URL 20 Characters
http://sciencenet.cn
Excerpt Page content
 科学网—构建全球华人科学社区 ...
Meta Keywords 5 Detected
科学 科学论坛 科学博客，科学电子杂志 科学时报，科技，科教，教育 科学家
Keywords Cloud Density
你的实验室安全吗2 我们的太阳系未来会怎样2 不要停止思考你的课题2 德布罗意2 本科毕业论文开题报告该怎么写2 中国科学报社2 小柯机器人2 你幸福吗2 兰州兽研所近百人感染布病2 量子英雄传2
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
你的实验室安全吗 2
我们的太阳系未来会怎样 2
不要停止思考你的课题 2
德布罗意 2
本科毕业论文开题报告该怎么写 2
中国科学报社 2
小柯机器人 2
你幸福吗 2
兰州兽研所近百人感染布病 2
量子英雄传 2
Google Preview Your look like this in google search result
科学网—构建全球华人科学社区
http://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。
Robots.txt File No Found
http://sciencenet.cn/robots.txt
Sitemap.xml File No Found
http://sciencenet.cn/sitemap.xml
Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system
Updated: 1970-01-01 / 51 years
Create on: 1970-01-01 / 51 years
Expires on: 1970-01-01 / 621 months 14 days

Nameservers
dns25.hichina.com
dns26.hichina.com
Page Size Code & Text Ratio
Document Size: ~81.27 KB
Code Size: ~58.26 KB
Text Size: ~23.01 KB Ratio: 28.31%

Estimation Traffic and Earnings

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Technologies

PWA - Manifest

Manifest is not valid
Your site don't have valid manifest.json, read more in Web App Manifest

Desktop

Desktop Screenshot
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Properly size images Potential savings of 108 KB
Serve images that are appropriately-sized to save cellular data and improve load time
Speed Index 4.9 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 0.3 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 941 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 0.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.3 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 3 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoid an excessive DOM size 913 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 0.3 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 64 requests • 941 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve static assets with an efficient cache policy 56 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 50 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 0.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Serve images in next-gen formats Potential savings of 459 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Does not use HTTPS 64 insecure requests found
All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs
Reduce server response times (TTFB) Root document took 5,210 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 50 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Efficiently encode images Potential savings of 366 KB
Optimized images load faster and consume less cellular data
Minimize third-party usage Third-party code blocked the main thread for 0 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

Mobile

Mobile Screenshot
Serve images in next-gen formats Potential savings of 459 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Does not use HTTPS 64 insecure requests found
All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs
Server response times are low (TTFB) Root document took 360 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 0 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Efficiently encode images Potential savings of 366 KB
Optimized images load faster and consume less cellular data
Minimize third-party usage Third-party code blocked the main thread for 20 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 610 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.1 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Defer offscreen images Potential savings of 214 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Speed Index 4.5 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 1.8 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 941 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 3.2 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 1.1 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 3 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoid an excessive DOM size 915 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 1.4 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 64 requests • 941 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve static assets with an efficient cache policy 56 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 590 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 2.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Estimated Input Latency 80 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
First Contentful Paint (3G) 1860 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network

Speed And Optimization Tips

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server 
HTTP/1.1 200 OK
Content-Length: 20160
Content-Type: text/html
Content-Encoding: gzip
Last-Modified: Sun, 08 Dec 2019 14:39:38 GMT
ETag: W/"b2356051d5add51:0"
Vary: Accept-Encoding
Server: Microsoft-IIS/8.5
X-Powered-By: ASP.NET
Date: Mon, 09 Dec 2019 01:01:33 GMT
DNS Records DNS Resource Records associated with a hostname
View DNS Records
Type Name Value Class TTL
A sciencenet.cn 39.106.55.29 IN 3572
NS sciencenet.cn dns25.hichina.com IN 22098
NS sciencenet.cn dns26.hichina.com IN 22098

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