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Mobile Usability

99/100

Good

Mobile Speed

44/100

Bad

Last tested: 2017-08-27

Rescan
coursera.org Mobile Usability: 99/100
coursera.org Mobile Usability Test Quick Overview

Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target <a href="https://learne…cles/201522945">Learner Help Center</a> is close to 1 other tap targets.
The tap target <a href="/" class="c-logo"></a> is close to 1 other tap targets.
The tap target <a href="/featured/top_…cale_en_os_web" class="link-button passive cozy">See All</a> is close to 1 other tap targets.
coursera.org Mobile Speed: 44/100
coursera.org Mobile Speed Test Quick Overview

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 3 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.
https://d3njjcbhbojbot.cloudfront.net/webapps/buil…867030a11c0a9b236cd.js
https://d3njjcbhbojbot.cloudfront.net/webapps/buil…32505e207461d028341.js
https://d3njjcbhbojbot.cloudfront.net/webapps/buil…a1de499fb5388faafbc.js
Optimize CSS Delivery of the following:
https://d3njjcbhbojbot.cloudfront.net/webapps/buil…67030a11c0a9b236cd.css
https://d3njjcbhbojbot.cloudfront.net/webapps/buil…1de499fb5388faafbc.css
Avoid landing page redirects

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://coursera.org/
https://coursera.org/
https://www.coursera.org/
Prioritize visible content

Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
Only about 65% of the final above-the-fold content could be rendered with the full HTML response.
Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.
Minify JavaScript for the following resources to reduce their size by 119.3KiB (20% reduction).
Minifying https://d3njjcbhbojbot.cloudfront.net/webapps/buil…867030a11c0a9b236cd.js could save 87.8KiB (29% reduction) after compression.
Minifying https://d3njjcbhbojbot.cloudfront.net/webapps/buil…a1de499fb5388faafbc.js could save 31.5KiB (11% reduction) after compression.
Reduce server response time

Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (5 minutes)
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (5 minutes)
https://d3njjcbhbojbot.cloudfront.net/api/utilitie…1&fit=crop&w=225&h=130 (10 minutes)
Optimize images

Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 9.6KiB (53% reduction).
Compressing https://d3njjcbhbojbot.cloudfront.net/web/images/f…touch-icon-144x144.png could save 5.8KiB (59% reduction).
Compressing https://d3njjcbhbojbot.cloudfront.net/web/images/i…_generic_rgb_wo_45.png could save 3.8KiB (48% reduction).

coursera.org Mobile Resources


Total Resources68
Number of Hosts3
Static Resources61
JavaScript Resources5
CSS Resources2

coursera.org Mobile Resource Breakdown