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49 csdn.net Last Updated: 9 months

Success 62% of passed verification steps
Warning 15% of total warning
Errors 23% of total errors, require fast action

Desktop

Mobile

Performance Desktop Score 37%
Best Practices Desktop Score 62%
SEO Desktop Score 90%
Progressive Web App Desktop Score 27%
Performance Mobile Score 82%
Best Practices Mobile Score 69%
SEO Mobile Score 90%
Progressive Web App Mobile Score 56%
Page Authority Authority 0%
Domain Authority Domain Authority 0%
Moz Rank 0.0/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 13 Characters
CSDN-专业IT技术社区
Meta Description 85 Characters
CSDN是全球知名中文IT技术交流平台,创建于1999年,包含原创博客、精品问答、职业培训、技术论坛、资源下载等产品服务,提供原创、优质、完整内容的专业IT技术开发社区.
Effective URL 20 Characters
https://www.csdn.net
Excerpt Page content
CSDN-专业IT技术社区 推荐 ...
Keywords Cloud Density
推荐不准27 选择理由27 精准屏蔽27 内容质量差27 python8 include6 cell5 mongodb5 knative3 java3
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
推荐不准 27
选择理由 27
精准屏蔽 27
内容质量差 27
python 8
include 6
cell 5
mongodb 5
knative 3
java 3
Google Preview Your look like this in google search result
CSDN-专业IT技术社区
https://www.csdn.net
CSDN是全球知名中文IT技术交流平台,创建于1999年,包含原创博客、精品问答、职业培训、技术论坛、资源下载等产品服务,提供原创、优质、完整内容的专业IT技术开发社区.
Robots.txt File Detected
Sitemap.xml File Detected
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: 2019-03-12 / 2 years
Create on: 1999-03-11 / 22 years
Expires on: 2021-03-11 / 5 months 15 days

Alibaba Cloud Computing (Beijing) Co., Ltd. ,
Registrar Whois Server: grs-whois.hichina.com
Registrar URL: http://www.net.cn

Nameservers
VIP3.ALIDNS.COM
VIP4.ALIDNS.COM
Page Size Code & Text Ratio
Document Size: ~370.82 KB
Code Size: ~250.89 KB
Text Size: ~119.93 KB Ratio: 32.34%

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
Remove unused CSS Potential savings of 69 KB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity
Uses deprecated APIs 1 warning found
Deprecated APIs will eventually be removed from the browser
Serve images in next-gen formats Potential savings of 4,493 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
Reduce server response times (TTFB) Root document took 2,210 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 90 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Enable text compression Potential savings of 22 KB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
Efficiently encode images Potential savings of 1,290 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
Total Blocking Time 1,090 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 3.2 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 4,714 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Properly size images Potential savings of 624 KB
Serve images that are appropriately-sized to save cellular data and improve load time
Speed Index 4.5 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 5.1 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).
Avoid enormous network payloads Total size was 10,328 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 5.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.7 s
First Contentful Paint marks the time at which the first text or image is painted
Includes front-end JavaScript libraries with known security vulnerabilities 2 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 17 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 2,671 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)
Minify JavaScript Potential savings of 28 KB
Minifying JavaScript files can reduce payload sizes and script parse time
First Meaningful Paint 0.7 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 263 requests • 10,331 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 82 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 980 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 7.8 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
Page load is not fast enough on mobile networks Interactive on simulated mobile network at 43.1 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 400 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

Mobile

Mobile Screenshot
Includes front-end JavaScript libraries with known security vulnerabilities 2 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 10 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
Avoids an excessive DOM size 591 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)
Minify JavaScript Potential savings of 2 KB
Minifying JavaScript files can reduce payload sizes and script parse time
First Meaningful Paint 2.5 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 40 requests • 1,231 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 14 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 240 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 4.7 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
First Contentful Paint (3G) 4782 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Estimated Input Latency 20 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
Tap targets are not sized appropriately 94% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements
Document uses legible font sizes 100% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Serve images in next-gen formats Potential savings of 834 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
Server response times are low (TTFB) Root document took 250 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 260 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 141 KB
Optimized images load faster and consume less cellular data
Enable text compression Potential savings of 50 KB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
Minimize third-party usage Third-party code blocked the main thread for 10 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 280 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.9 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 382 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Speed Index 4.3 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 4.1 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 1,231 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 2.5 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 2.5 s
First Contentful Paint marks the time at which the first text or image is painted

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
Date: Mon, 23 Dec 2019 03:03:17 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Set-Cookie: acw_tc=2760829215770701968295466eae769b8d3e3223dc0402873559be52c50485;path=/;HttpOnly;Max-Age=2678401
Server: openresty
Set-Cookie: uuid_tt_dd=10_28130729260-1577070196839-457418; Expires=Thu, 01 Jan 2025 00:00:00 GMT; Path=/; Domain=.csdn.net;
Set-Cookie: dc_session_id=10_1577070196839.745837; Expires=Thu, 01 Jan 2025 00:00:00 GMT; Path=/; Domain=.csdn.net;
Vary: Accept-Encoding
Content-Encoding: gzip
Strict-Transport-Security: max-age=86400
DNS Records DNS Resource Records associated with a hostname
View DNS Records

Comments

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