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Top Technologies

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Web Frameworks

87 edx.org Last Updated: 9 months

Success 78% of passed verification steps
Warning 15% of total warning
Errors 7% of total errors, require fast action

Desktop

Mobile

Performance Desktop Score 91%
Best Practices Desktop Score 85%
SEO Desktop Score 100%
Progressive Web App Desktop Score 19%
Performance Mobile Score 38%
Best Practices Mobile Score 69%
SEO Mobile Score 97%
Progressive Web App Mobile Score 15%
Page Authority Authority 63%
Domain Authority Domain Authority 89%
Moz Rank 6.3/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 49 Characters
EDX |--- ONLINE COURSES BY HARVARD, MIT, & MORE
Meta Description 138 Characters
Access 2000--- online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.
Effective URL 19 Characters
https://www.edx.org
Excerpt Page content
edX |--- Online Courses by Harvard, MIT, & more Skip to main content
Meta Keywords 4 Detected
Keywords Cloud Density
skip1 main1 content1
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
skip 1
main 1
content 1
Google Preview Your look like this in google search result
EDX |--- ONLINE COURSES BY HARVARD, MIT, & MORE
https://www.edx.org
Access 2000--- online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.
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: 2018-10-25 / 2 years
Create on: 2001-11-25 / 19 years
Expires on: 2019-11-25 / 8 months 21 days

Gandi SAS ,US
Registrar Whois Server: whois.gandi.net
Registrar URL: http://www.gandi.net

Nameservers
NS-1472.AWSDNS-56.ORG
NS-73.AWSDNS-09.COM
NS-1753.AWSDNS-27.CO.UK
NS-828.AWSDNS-39.NET
Page Size Code & Text Ratio
Document Size: ~17.91 KB
Code Size: ~15.24 KB
Text Size: ~2.67 KB Ratio: 14.91%

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 120 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.6 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
Speed Index 1.4 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 1.7 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 1,284 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 1.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.8 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 7 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 21 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 324 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 6 KB
Minifying JavaScript files can reduce payload sizes and script parse time
First Meaningful Paint 1.3 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 95 requests • 1,284 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 43 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 120 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 2.1 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 14.4 s
A fast page load over a cellular network ensures a good mobile user experience
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
Remove unused CSS Potential savings of 66 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
Serve images in next-gen formats Potential savings of 9 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
User Timing marks and measures 1 user timing
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Server response times are low (TTFB) Root document took 70 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 600 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Minimize third-party usage Third-party code blocked the main thread for 80 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
Avoids enormous network payloads Total size was 1,279 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 7.9 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 3.3 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 7 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 21 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 318 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 6 KB
Minifying JavaScript files can reduce payload sizes and script parse time
First Meaningful Paint 5.5 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 96 requests • 1,279 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 44 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 600 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 14.4 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 at 14.4 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 170 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) 6287 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Tap targets are not sized appropriately 66% 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 96% 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
Remove unused CSS Potential savings of 68 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
Serve images in next-gen formats Potential savings of 42 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 1 insecure request 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
User Timing marks and measures 1 user timing
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Server response times are low (TTFB) Root document took 60 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 2,260 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Reduce the impact of third-party code Third-party code blocked the main thread for 1,570 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 2,700 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 4.9 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Defer offscreen images Potential savings of 84 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
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
Speed Index 5.0 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 10.1 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).

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: Tue, 26 Nov 2019 21:15:40 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Set-Cookie: __cfduid=d3843d10d2b3d2f1dfb0cff63650d60e01574802940; expires=Thu, 26-Dec-19 21:15:40 GMT; path=/; domain=.edx.org; HttpOnly
CF-Ray: 53bee10b2abdc518-ORD
CF-Cache-Status: HIT
Cache-Control: s-maxage=300, max-age=0, must-revalidate
Age: 787
Content-Language: en
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Last-Modified: Tue, 26 Nov 2019 21:02:23 GMT
Set-Cookie: prod-edx-cf-loc=US; Path=/; Expires=Thu, 26 Nov 2020 21:15:40 GMT
Strict-Transport-Security: max-age=2592000
Vary: X-Accept-Language,Accept-Encoding
Via: varnish
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
X-AH-Environment: prod
X-Cache: HIT
X-Cache-Hits: 3
X-Content-Type-Options: nosniff
X-Drupal-Cache: MISS
X-Frame-Options: SameOrigin
X-Generator: Drupal 7 (http://drupal.org)
X-Request-ID: v-0aeabb04-1090-11ea-9c81-e70550aee825
Server: cloudflare
Content-Encoding: gzip
DNS Records DNS Resource Records associated with a hostname
View DNS Records

Comments

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