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Top Technologies

Nginx
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Web Frameworks

90 coursera.org Last Updated: 10 months

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

Desktop

Mobile

Performance Desktop Score 61%
Best Practices Desktop Score 92%
SEO Desktop Score 91%
Progressive Web App Desktop Score 31%
Performance Mobile Score 31%
Best Practices Mobile Score 92%
SEO Mobile Score 92%
Progressive Web App Mobile Score 33%
Page Authority Authority 66%
Domain Authority Domain Authority 92%
Moz Rank 6.6/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 75 Characters
COURSERA | ONLINE COURSES & CREDENTIALS BY TOP EDUCATORS. JOIN FOR---
Meta Description 312 Characters
Learn online and earn credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for--- and transform your career with degrees, certificates, Specializations, & MOOCs in data science, computer science, business, and dozens of other topics.
Effective URL 24 Characters
https://www.coursera.org
Excerpt Page content
Coursera | Online Courses & Credentials by Top Educators. Join for--- ListExploreFor EnterpriseJoin for---Log InLoupe CopyExploreArts and HumanitiesBusinessComputer ScienceData ScienceInformation TechnologyHealthMath and LogicPersonal De...
Keywords Cloud Density
coursera15 certificate11 skills10 learning10 business10 professional9 science7 online7 university7 they6
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
coursera 15
certificate 11
skills 10
learning 10
business 10
professional 9
science 7
online 7
university 7
they 6
Google Preview Your look like this in google search result
COURSERA | ONLINE COURSES & CREDENTIALS BY TOP EDUCATORS
https://www.coursera.org
Learn online and earn credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for fr
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: 2013-07-02 / 7 years
Create on: 2012-01-12 / 9 years
Expires on: 2023-01-12 / 26 months 28 days

GoDaddy.com, LLC ,US
Registrar Whois Server: whois.godaddy.com
Registrar URL: http://www.whois.godaddy.com

Nameservers
NS-1481.AWSDNS-57.ORG
NS-1590.AWSDNS-06.CO.UK
NS-258.AWSDNS-32.COM
NS-688.AWSDNS-22.NET
Page Size Code & Text Ratio
Document Size: ~434.17 KB
Code Size: ~201.16 KB
Text Size: ~233.01 KB Ratio: 53.67%

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
Keep request counts low and transfer sizes small 182 requests • 2,302 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 31 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 470 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 4.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
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 20.1 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 100 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 72 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
User Timing marks and measures 23 user timings
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Reduce server response times (TTFB) Root document took 790 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 250 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 28 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 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 350 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 1.5 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 318 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
Properly size images Potential savings of 12 KB
Serve images that are appropriately-sized to save cellular data and improve load time
Speed Index 2.7 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 3.5 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 2,302 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 2.2 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.8 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 4 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 664 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 4 KB
Minifying JavaScript files can reduce payload sizes and script parse time
First Meaningful Paint 0.8 s
First Meaningful Paint measures when the primary content of a page is visible

Mobile

Mobile Screenshot
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 1,162 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 7 KB
Serve images that are appropriately-sized to save cellular data and improve load time
Speed Index 13.0 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 5.5 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 3,220 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 8.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 2.9 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
Avoids an excessive DOM size 597 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 4 KB
Minifying JavaScript files can reduce payload sizes and script parse time
First Meaningful Paint 2.9 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 184 requests • 3,220 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 31 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 1,650 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 22.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
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 22.3 s
A fast page load over a cellular network ensures a good mobile user experience
First Contentful Paint (3G) 5790 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 930 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 sized appropriately 100% 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
Remove unused CSS Potential savings of 73 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 136 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 23 user timings
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 580 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 660 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 28 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 150 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 1,820 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 6.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this

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-Type: text/html
Content-Length: 0
Connection: keep-alive
Cache-Control: private, no-cache, no-store, must-revalidate, max-age=0
Date: Thu, 26 Dec 2019 06:00:54 GMT
etag: W/"5e992-mIPtpZJSZF5uqfOr7hPF0UDR1UQ"
Server: envoy
Set-Cookie: CSRF3-Token=1578204054.y6Qw3ButbCc2ZVqJ; Max-Age=864000; Expires=Sun, 05 Jan 2020 06:00:54 GMT; Path=/; Domain=.coursera.org
Set-Cookie: __204u=6420878883-1577340054255; Max-Age=31536000; Expires=Fri, 25 Dec 2020 06:00:54 GMT; Path=/; Domain=.coursera.org
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Content-Type-Options: nosniff
x-coursera-render-mode: html
x-coursera-render-version: v2
X-Coursera-Request-Id: E75YaielEeqNnhLD3DzQwQ
X-Coursera-Trace-Id-Hex: 3874aa5547d7aba2
x-envoy-upstream-service-time: 499
X-Frame-Options: SAMEORIGIN
x-powered-by: Express
X-XSS-Protection: 1; mode=block
X-Cache: Miss from cloudfront
Via: 1.1 836d15812518886911b1ae2be813f462.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: IAD79-C1
X-Amz-Cf-Id: BHH7II9_4NX_8oVp5ll9VNwtv-3sN8DIM48Q9WA3DT748ToMN3udgA==
DNS Records DNS Resource Records associated with a hostname
View DNS Records

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