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Mobile Usability

96/100

Good

Mobile Speed

57/100

Bad

Last tested: 2017-08-27

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duolingo.com Mobile Usability: 96/100
duolingo.com Mobile Usability Test Quick Overview

Avoid plugins

Your page uses plugins, which prevents portions of your page from being used on many platforms. Find alternatives for plugin based content to increase compatibility.
Find alternatives for the following Flash plugins.
https://www.duolingo.com/swf/sm2/2015/soundmanager2.swf
duolingo.com Mobile Speed: 57/100
duolingo.com Mobile Speed Test Quick Overview

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

Your page has 2 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.
https://d7mj4aqfscim2.cloudfront.net/proxy/js2/251…9eb4a9b950e3-vendor.js
https://d7mj4aqfscim2.cloudfront.net/proxy/js2/251…b4a9b950e3-duolingo.js
Optimize CSS Delivery of the following:
https://d7mj4aqfscim2.cloudfront.net/proxy/css2/17…81ea5934e0e3_0.min.css
https://d7mj4aqfscim2.cloudfront.net/proxy/css2/17…81ea5934e0e3_1.min.css
https://d7mj4aqfscim2.cloudfront.net/proxy/css2/17…81ea5934e0e3_2.min.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://d3kwyfyztuo0xs.cloudfront.net/config/latest/0.9.3 (expiration not specified)
https://ljknv3sref.execute-api.us-east-1.amazonaws.com/prod/events (expiration not specified)
https://www.duolingo.com/diagnostics/js_error (expiration not specified)
https://assets.zendesk.com/embeddable_framework/main.js (60 seconds)
https://content.googleapis.com/discovery/v1/apis/o…%2CbatchPath%2Cid&pp=0 (5 minutes)
https://content.googleapis.com/discovery/v1/apis/p…%2CbatchPath%2Cid&pp=0 (5 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/en_US/sdk.js (20 minutes)
https://connect.facebook.net/signals/config/1735692093320310?v=2.7.6 (20 minutes)
https://apis.google.com/js/client:plusone.js?onloa…dGoogleClientLibraries (30 minutes)
https://apis.google.com/js/rpc:shindig_random.js?onload=init (30 minutes)
https://ssl.google-analytics.com/ga.js (2 hours)
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.
None of the final above-the-fold content could be rendered even with the full HTML response.

duolingo.com Mobile Resources


Total Resources50
Number of Hosts19
Static Resources31
JavaScript Resources24
CSS Resources3

duolingo.com Mobile Resource Breakdown