1.4 sec in total
15 ms
1.1 sec
328 ms
Welcome to coursera.org homepage info - get ready to check Coursera best content for India right away, or after learning these important things about coursera.org
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Visit coursera.orgWe analyzed Coursera.org page load time and found that the first response time was 15 ms and then it took 1.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.
coursera.org performance score
name
value
score
weighting
Value3.5 s
34/100
10%
Value4.1 s
47/100
25%
Value10.7 s
7/100
10%
Value3,040 ms
2/100
30%
Value0
100/100
15%
Value25.3 s
0/100
10%
15 ms
583 ms
268 ms
66 ms
62 ms
Our browser made a total of 37 requests to load all elements on the main page. We found that 5% of them (2 requests) were addressed to the original Coursera.org, 95% (35 requests) were made to D3njjcbhbojbot.cloudfront.net. The less responsive or slowest element that took the longest time to load (583 ms) belongs to the original domain Coursera.org.
Page size can be reduced by 1.5 MB (64%)
2.3 MB
829.7 kB
In fact, the total size of Coursera.org 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. 70% of websites need less resources to load. HTML takes 1.0 MB which makes up the majority of the site volume.
Potential reduce by 852.8 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. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 852.8 kB or 82% of the original size.
Potential reduce by 65.3 kB
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. Obviously, Coursera needs image optimization as it can save up to 65.3 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 349.2 kB
It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 349.2 kB or 69% of the original size.
Potential reduce by 193.5 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. Coursera.org needs all CSS files to be minified and compressed as it can save up to 193.5 kB or 85% of the original size.
Number of requests can be reduced by 3 (9%)
32
29
The browser has sent 32 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Coursera. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.
coursera.org
15 ms
www.coursera.org
583 ms
all.css
268 ms
jhu-logo-thumb.png
66 ms
UCSD_BigData_PartnerProvided.jpg
62 ms
python.jpg
66 ms
Duke_ExceltoMySQLGetty529354813.jpg
61 ms
Penn_BusinessAnalytics_Istock49060600.jpg
62 ms
hci-large-icon-_600_.png
71 ms
1_iStock_000039306742_Large_Coursera.jpg
66 ms
tesol_ASU_banner.jpg
63 ms
atget-cropped_course-still.jpg
66 ms
Learning-How-to-Learn-Logo-with-text.png
70 ms
Rprogramming.jpg
70 ms
large-icon.png
77 ms
pythonlearn_thumbnail_1x1.png
76 ms
robotica.png
75 ms
DataScientistsToolbox.jpg
73 ms
grammar.jpg
74 ms
large-icon.png
82 ms
Faded-logo.jpg
81 ms
large-icon.png
90 ms
large-icon.png
81 ms
iipp_icon.png
95 ms
MP900433088.jpg
90 ms
large-icon.png
87 ms
Terrorism-and-Counterterrorism.jpg
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download_on_the_app_store_badge_en.svg
90 ms
en_generic_rgb_wo_45.png
93 ms
banner_image_1280x320_Tec_2.jpg
70 ms
OpenSans-Regular.woff
68 ms
Intl.en-US.js
15 ms
preloader.r.rjsBundle.90bd4dac012f4e66aab6078f8ca3a27c.6.js
32 ms
loader.r.rjsBundle.21dc2cb725d4b21b0b8747c101c82736.6.js
33 ms
startApp.sub.rjsBundle.0484ad0de1e6c0dd05a3beaedef07aa4.6.js
34 ms
Merriweather-Light.woff
20 ms
coursera.v17.woff
19 ms
coursera.org accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
coursera.org best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Page has valid source maps
coursera.org SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Links do not have descriptive text
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).
Impact
Issue
Document uses legible font sizes
Tap targets are not sized appropriately
EN
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Coursera.org can be misinterpreted by Google and other search engines. Our service has detected that English 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 Coursera.org 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.
coursera.org
Open Graph data is detected on the main page of Coursera. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: