Runestone.academy Site Title

Free Online Textbooks for Math and Computer Science - Runestone Academy

Runestone.academy Test Results

runestone.academy Mobile Usability: 96/100

Quick overview:
Size content to viewport
The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.
The page content is 427 CSS pixels wide, but the viewport is only 412 CSS pixels wide. The following elements fall outside the viewport:
The element <div class="navbar-header"></div> falls outside the viewport.
...

runestone.academy Mobile Speed: 59/100

Quick overview:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 5 blocking script resources and 6 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://runestone.academy/runestone/static/js/jquery-1.10.2.min.js
...
Optimize CSS Delivery of the following:
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css
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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://runestone.academy/runestone/static/bootstrap-sphinx.css (expiration not specified)
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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://runestone.academy/
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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 73.9KiB (64% reduction).
Compressing https://runestone.academy/runestone/static/js/jquery-1.10.2.min.js could save 58.9KiB (64% reduction).
...
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 26.1KiB (46% reduction).
Compressing https://runestone.academy/runestone/static/images/logo_small.png could save 26.1KiB (46% reduction).
Reduce server response time
In our test, your server responded in 0.37 seconds.
There are many factors that can slow down your server response time. Please read our recommendations to learn how you can monitor and measure where your server is spending the most time.
Minify CSS
Compacting CSS code can save many bytes of data and speed up download and parse times.
Minify CSS for the following resources to reduce their size by 6.3KiB (28% reduction).
Minifying https://runestone.academy/runestone/static/runestone-custom-sphinx-bootstrap.css could save 3KiB (30% reduction).
...
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 2.7KiB (32% reduction).
Minifying https://runestone.academy/runestone/static/bootstrap-sphinx.js could save 1.7KiB (48% reduction).
...
Minify HTML
Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.
Minify HTML for the following resources to reduce their size by 1,008B (17% reduction).
Minifying https://runestone.academy/runestone/default/user/login?_next=/runestone/default/index could save 1,008B (17% reduction) after compression.

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