793 ms in total
27 ms
766 ms
0 ms
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Visit coursera.helpWe analyzed Coursera.help page load time and found that the first response time was 27 ms and then it took 766 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.
coursera.help performance score
name
value
score
weighting
Value3.2 s
43/100
10%
Value3.8 s
55/100
25%
Value10.2 s
9/100
10%
Value6,450 ms
0/100
30%
Value0
100/100
15%
Value26.6 s
0/100
10%
27 ms
532 ms
59 ms
109 ms
108 ms
Our browser made a total of 35 requests to load all elements on the main page. We found that 3% of them (1 request) were addressed to the original Coursera.help, 94% (33 requests) were made to D3njjcbhbojbot.cloudfront.net and 3% (1 request) were made to Coursera.org. The less responsive or slowest element that took the longest time to load (532 ms) relates to the external source Coursera.org.
Page size can be reduced by 1.5 MB (65%)
2.3 MB
801.5 kB
In fact, the total size of Coursera.help 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 852.6 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 852.6 kB or 82% of the original size.
Potential reduce by 58.6 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 58.6 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 349.5 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 349.5 kB or 69% of the original size.
Potential reduce by 196.0 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.help needs all CSS files to be minified and compressed as it can save up to 196.0 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.help
27 ms
www.coursera.org
532 ms
all.css
59 ms
jhu-logo-thumb.png
109 ms
UCSD_BigData_PartnerProvided.jpg
108 ms
python.jpg
42 ms
Duke_ExceltoMySQLGetty529354813.jpg
41 ms
Penn_BusinessAnalytics_Istock49060600.jpg
109 ms
hci-large-icon-_600_.png
114 ms
1_iStock_000039306742_Large_Coursera.jpg
113 ms
tesol_ASU_banner.jpg
134 ms
atget-cropped_course-still.jpg
118 ms
Learning-How-to-Learn-Logo-with-text.png
109 ms
large-icon.png
112 ms
Rprogramming.jpg
117 ms
pythonlearn_thumbnail_1x1.png
116 ms
robotica.png
114 ms
DataScientistsToolbox.jpg
113 ms
grammar.jpg
119 ms
large-icon.png
121 ms
Faded-logo.jpg
120 ms
large-icon.png
124 ms
large-icon.png
121 ms
MP900433088.jpg
123 ms
large-icon.png
123 ms
Terrorism-and-Counterterrorism.jpg
124 ms
Course-Image3200x1800.png
129 ms
download_on_the_app_store_badge_en.svg
125 ms
en_generic_rgb_wo_45.png
130 ms
Intl.en-US.js
42 ms
preloader.r.rjsBundle.90bd4dac012f4e66aab6078f8ca3a27c.6.js
42 ms
loader.r.rjsBundle.be5f1b33adf4f20066cc4921c26367d8.6.js
60 ms
startApp.sub.rjsBundle.5865f507b8a0d554d40a89a329a5e988.6.js
60 ms
pennstatebanner1.jpg
53 ms
OpenSans-Regular.woff
50 ms
coursera.help 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.help 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.help 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.help 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.help 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.help
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: