Edx.org Site Title

edX | Free Online Courses by Harvard, MIT, & more

Edx.org Meta Description

Access 2000 free online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.

Edx.org Test Results

edx.org Mobile Usability: 97/100

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 <div id="logo" class="edx-logo"></div> is close to 1 other tap targets .
...

edx.org Mobile Speed: 43/100

Quick overview:
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 493.6KiB (49% reduction).
Compressing https://www.edx.org/sites/default/files/homepage/learner_stories/images/noree_485x320.jpg could save 73.6KiB (73% reduction).
...
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 10 blocking script resources and 4 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
https://www.edx.org/sites/default/files/js/js_ri60QNjcazMKdlAmWmDsmRb0iKaVkkXUQxH2MsgpmVo.js
...
Optimize CSS Delivery of the following:
https://www.edx.org/sites/default/files/css/css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css
...
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://ak.sail-horizon.com/onsite/personalize.v0.0.4.min.js (expiration not specified)
...
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 3% 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 4.6KiB (12% reduction).
Minifying https://www.edx.org/sites/default/files/js/js_ri60QNjcazMKdlAmWmDsmRb0iKaVkkXUQxH2MsgpmVo.js could save 4.6KiB (12% reduction) after compression.

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