4.3 sec in total
38 ms
2.1 sec
2.2 sec
Visit coursera.com now to see the best up-to-date Coursera content for United States and also check out these interesting facts you probably never knew about coursera.com
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Visit coursera.comWe analyzed Coursera.com page load time and found that the first response time was 38 ms and then it took 4.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.
coursera.com performance score
name
value
score
weighting
Value3.2 s
42/100
10%
Value3.8 s
56/100
25%
Value12.6 s
3/100
10%
Value3,730 ms
1/100
30%
Value0.044
99/100
15%
Value25.0 s
0/100
10%
38 ms
795 ms
186 ms
543 ms
579 ms
Our browser made a total of 67 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Coursera.com, 97% (65 requests) were made to D3njjcbhbojbot.cloudfront.net and 1% (1 request) were made to Coursera.org. The less responsive or slowest element that took the longest time to load (795 ms) relates to the external source Coursera.org.
Page size can be reduced by 3.1 MB (74%)
4.2 MB
1.1 MB
In fact, the total size of Coursera.com main page is 4.2 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. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Javascripts take 1.8 MB which makes up the majority of the site volume.
Potential reduce by 1.5 MB
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 1.5 MB or 87% of the original size.
Potential reduce by 28.2 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. Coursera images are well optimized though.
Potential reduce by 1.4 MB
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 1.4 MB or 77% of the original size.
Potential reduce by 194.7 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.com needs all CSS files to be minified and compressed as it can save up to 194.7 kB or 85% of the original size.
Number of requests can be reduced by 3 (5%)
59
56
The browser has sent 59 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.com
38 ms
www.coursera.org
795 ms
all.css
186 ms
Penn-logo.png
543 ms
jhu_logo.png
579 ms
U-M_bmp.png
579 ms
stanford.png
578 ms
UC-San-Diego-blue--gold.png
563 ms
Duke_University_Logo.png
584 ms
download_on_the_app_store_badge_en.svg
513 ms
en_generic_rgb_wo_45.png
518 ms
baseline_banner_img.png
258 ms
jhu-logo-thumb.png
253 ms
python.jpg
253 ms
machinelearning.jpg
255 ms
Duke_ExceltoMySQLGetty529354813.jpg
253 ms
1_iStock_000039306742_Large_Coursera.jpg
255 ms
pythondatascience_specialization_final.png
272 ms
UCSD_BigData_PartnerProvided.jpg
280 ms
Penn_BusinessAnalytics_Istock49060600.jpg
275 ms
large-icon.png
272 ms
Learning-How-to-Learn-Logo-with-text.png
307 ms
pythonlearn_thumbnail_1x1.png
275 ms
large-icon.png
276 ms
Rprogramming.jpg
306 ms
large-icon.png
305 ms
python_datascience_thumbnail_introduction_1x1.png
304 ms
DataScientistsToolbox.jpg
304 ms
jhep-coursera-course5.png
304 ms
large-icon.png
305 ms
instru.jpeg
295 ms
jhep-coursera-course4.png
298 ms
img_9597_25845070142_o.jpg
297 ms
spn-logo.png
297 ms
contractnegotiations_Logo_080814d.jpg
295 ms
ECON252.jpeg
298 ms
wharton-business-foundations-logo.jpg
312 ms
LightBulb.jpg
311 ms
OpenSans-Regular.woff
311 ms
OpenSans-Bold.woff
299 ms
digital_marketing_specialization_logo.jpg
286 ms
Career-Success-3-rings-600x600_v2.jpg
322 ms
finanzas_personales.jpg
323 ms
shutterstock_87219583.jpg
319 ms
JHU_FullStackRubyonRails_Getty526055809.jpg
318 ms
large-icon.png
318 ms
FinalLogo.png
317 ms
large-icon.png
285 ms
twenty20_54db5e50-8425-4ffd-a4fd-8ba5b4813b9a.jpg
285 ms
FundamentalofComputing_1024x1024_graphic.jpg
285 ms
Brueghel-Children.jpg
285 ms
psychbuddhism-logo.jpg
284 ms
iStock_000002041388_ExtraSmall.jpg
269 ms
Wanting-to-be-happy.JPG
267 ms
positive_psychology_course_image.jpg
267 ms
logo_PAP_ondem_2.jpg
304 ms
aprender-logo-def-ok.png
302 ms
Logo_vierkant_witter.png
291 ms
howitworks_ipad_v2.png
276 ms
Merriweather-Light.woff
254 ms
OpenSans-Semibold.woff
256 ms
Merriweather-Regular.woff
256 ms
coursera.v25.woff
253 ms
Intl.en-US.js
148 ms
preloader.r.rjsBundle.a6ef7e42aa58a6bb0d8c7c7c52a203b4.6.js
148 ms
loader.r.rjsBundle.3c60b52d3a7d3469c6e195bd659134dd.6.js
149 ms
startApp.sub.rjsBundle.27a5ddf14e1f013333b2047439638eef.6.js
192 ms
coursera.com 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.com 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.com 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.com 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.com 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.com
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: