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Mobile Usability

100/100

Good

Mobile Speed

72/100

Medium

Last tested: 2017-08-27

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khanacademy.org Mobile Speed: 72/100
khanacademy.org Mobile Speed Test Quick Overview

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

Your page has 1 blocking CSS resources. This causes a delay in rendering your page.
Optimize CSS Delivery of the following:
https://cdn.kastatic.org/genfiles/stylesheets/en/s…mal-package-d51c0e.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/horizon/v1.js (expiration not specified)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/917218295030130?v=next (20 minutes)
https://s3.amazonaws.com/ki.js/53782/bH0.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
Reduce server response time

Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.
Enable compression for the following resources to reduce their transfer size by 9.5KiB (73% reduction).
Compressing https://cdn.kastatic.org/images/homepage/mountains.svg could save 9.5KiB (73% reduction).
Optimize images

Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 1.3KiB (25% reduction).
Compressing https://cdn.kastatic.org/genfiles/topic-icons/icon…s.jpg-76dc81-128c.jpeg could save 1.3KiB (25% reduction).

khanacademy.org Mobile Resources


Total Resources32
Number of Hosts7
Static Resources24
JavaScript Resources16
CSS Resources1

khanacademy.org Mobile Resource Breakdown