Pagespeed Optimization

Test a page for common page speed issues.

Updated: October 26th 2015

Page speed

Patrick Sexton

Common page speed issues and their solutions are discussed and illustrated by Patrick Sexton.

critical rendering path

Critical Rendering Path

The most important concept in all of pagespeed. Make big pages load faster.

server response

Reduce server response time

Make sure your server is providing your pages quickly to the browser.

files cached by browser

Leverage browser caching

Help browsers "remember" your resources (logo,css, etc.) so it can load faster.

render block

Render blocking javascript

When javascript is keeping the page from loading as fast as it should, your users wait.

above the fold

Prioritize visible content

Above the fold content optimizations for your users (and your ranking).

clock and javascript file

Defer loading javascript

Until your javascript is downloaded your page won't display unless you defer it.

css file and webpage

Optimize CSS delivery

Your CSS should help your webpage render fast, not slow down your webpage.


Enable Compression / Gzip

Compressing with gzip helps speed up your pages and reduce bandwidth used.


Content Delivery Networks

Content delivery networks (CDNs) get your webpage files closer and faster to your users.

question mark over webpage

Avoid bad requests

Sometimes your HTML or CSS will request a resource like an image or a html file that doesn't exist.

files in row

Enable keep-alive

Keep-alive enables the browser to get files without repeated and wasteful server communication.

The @ symbol pointing at a file

Avoid CSS @import

The @import method of retrieving CSS files affects your page speed and should not be used.

arrows representing redirects

Minimize redirects

Redirects cause major performance and speed issues. Use with caution.

html on page

Optimize style / script order

Style tags and calls to stylesheets should be placed before your scripts. If you do this your pages load faster.

small files entering a large file

Combine external javascript

Combining javascript allows page to load faster by requesting less files.

small files entering a large file

Combine external CSS

Combining css files allows page to load faster by requesting less files.

big file arrow small file

Minify CSS

No matter how you use your CSS, smaller is better and will help your webpages load faster.

arrows from webpage

Minimize DNS lookups

As a webpage becomes more feature-rich it often uses more DNS lookups which makes it render much slower.

images and clock

Deferring Images

A way to defer images without using jQuery or lazy loading.

small images making a large image

CSS image sprites

Combining small images into one bigger one means the page needs to load less to render.

css code on html file

Inline small CSS

Inlining CSS is just putting your CSS into your HTML file instead of keeping it as an external CSS file.

webfont loading to webpage

Web font options

Finding the fastest way to deliver your web fonts to your users.

javascript in an html file

Inline small JS

Inlining JS is just putting your javascript into your HTML file, not an external JS file.

a video file and clock

Defer videos

Videos from Youtube, Vimeo and other sources can be deferred using this simple method.

htaccess file

The .htaccess file

The .htaccess file controls enables a webmaster to control many page speed issues from one file.

javascripts and clock

Defer multiple javascripts

Most webpages need to defer many things, but most articles only show how to defer one thing. Learn how to defer just about anything here.

images and html file

Base64 image encoding

Smaller images can be inlined into the html to save requests and round trips, rather than downloading each image.

browser and server communicating

Time to first byte - TTFB

Learn what TTFB is and how to optimize it to be faster.

css file blocking a webpage

Render blocking CSS

CSS is render blocking and often can not be removed, so how is it optimized?.

page interaction point

Page interaction point

Optimize for the pages core functionality. Let the user do they want as soon as possible.

secure locked and unlocked


HTTP Strict Transport Security can be used to remove the redirect needed for secure sites from http to https.

server and browser talking

Intro to HTTP

An introduction to HTTP. Understanding how HTTP works can help your pages perform better.

server and browser talking

First View

The first view performance metric replicates the experience of a user encountering a webpage for the first time.

browser building webpage

How a webpage is displayed

An overview of how a webpage is retrieved and displayed in a browser. Touches on the request, response, build, and render.

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