Physics.info Site Title

The Physics Hypertextbook

Physics.info Meta Description

The Physics Hypertextbook is a reaction to the three big problems with textbooks: lack of writer's voice, layouts that reduce readability, and outdated economics. It is a work in progress. Some parts of this book are essentially finished. Some parts are comically underdone. I work on this project in my spare time. You are welcome to use this website as an educational or entertainment tool.

Physics.info Test Results

physics.info Mobile Usability: 100/100

physics.info Mobile Speed: 69/100

Quick overview:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 1 blocking script resources and 2 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://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js
Optimize CSS Delivery of the following:
http://scubaranch.com/walnut.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:
http://m.addthisedge.com/live/boost/elert/_ate.track.config_resp (60 seconds)
...
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 6.4KiB (35% reduction).
Minifying https://www.google.com/uds/api/search/1.0/0c3990ce7a056ed50667fe0c3873c9b6/default+en.css could save 3.9KiB (40% reduction) after compression.
...
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 2.4KiB (70% reduction).
Compressing http://www.google.com/cse/static/en/google_custom_search_watermark.gif could save 1.4KiB (69% 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 987B (16% reduction).
Minifying http://physics.info/ could save 987B (16% reduction) after compression.
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