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Empirical Study of Web Site Speed on Search Engine Rankings

This article summarizes the results of a study on load time factors in Google search engine rankings. The empirical study found that website crawl time and its variability strongly correlates with search engine position. more »

Case Study: PhiladelphiaOrthodontists.com Mobile Responsive Redesign

What happens when you convert a site to be mobile responsive? Mobile traffic increased by 24% and mobile browsers stayed 80% longer after a responsive redesign. more »

Use a Website Accelerator

Automated website acceleration products can speed up your site without developer intervention. We test the effectiveness of Radware's Fastview appliance on a test site and find significant improvements in speed. more »

Optimize Start Render Time

HCI guidelines say load useful content within 1-2 seconds, do your pages measure up? Learn how to optimize the start render time of your web pages to speed up useful content display. more »

Flush HTML Early and Often

Developers can speed up start render times by flushing a portion of their HTML document to the client even before the entire HTML file is ready. Both Yahoo! Search and Google use this performance technique. more »

Localize External Resources

Even popular offsite widgets can slow down or hang your web pages. Learn how to localize offsite resources to improve web page performance. more »

Use a Web Page Optimization Tool

Web page analysis and optimization tools can help locate and minimize performance bottlenecks. They can improve accessibility, spelling, XHTML markup, and even search engine visibility. We update our survey of the web page optimization tool landscape. more »

Page Speed Online

The online version of Google's Page Speed browser extension features a new mobile web page analysis mode. more »

Serving 2012 Olympic Tickets: London2012 15, CoSport 0

The race is on to get tickets to the 2012 Summer Olympics in London, England. Are the web sites handing the traffic as fast as the athletes they promote? more »

Automatically Speed Up Your Site with mod_pagespeed for Apache

mod_pagespeed is an open-source Apache module that automatically speeds up web sites. Through a number of filters, mod_pagespeed trims the fat off your HTML, CSS, JavaScript and images, reduces HTTP requests, and improves caching. In this article we introduce mod_pagespeed and summarize the available filters. more »

Anatomy of a Redesign

A behind the screens look at a recent redesign of WebsiteOptimization.com. Includes CSS sprites, Movable Type integration, and a three-dimensional look. more »

O'Reilly Books on Web Performance

We sum up the available books on web performance from O'Reilly. more »

Inline Images with Data URLs

Learn how to embed images into your web pages with data URLs. The data: URI scheme includes images directly into your XHTML pages using code instead of external files, saving valuable HTTP requests. more »

CSS Sprites: How Yahoo.com and AOL.com Improve Web Performance

Learn how AOL and Yahoo! use CSS sprites to improve performance for their busy home pages. CSS sprites save HTTP requests by using CSS positioning to selectively display composite background images. To maximize accessibility and usability, CSS sprites are best used for icons or decorative effects. more »

Highlight the Current Page with CSS: The Body ID/Class Method

This article shows how to automatically highlight menu items that correspond to the current page using CSS and XHTML. These "you are here" waypoints help orient users and improve usability. Using CSS avoids the need for complex scripting which simplifies maintenance and improves performance. more »

Combine Images to Save HTTP Requests

Learn how to reduce the number of HTTP requests required by your web pages by combining adjacent images and optionally imagemapping the links. This tutorial shows both client and server side techniques you can use to save precious HTTP requests and speed up your site. more »

Accessible CSS Forms: Using CSS to Create a Two-Column Layout

Websites have become less accessible and more complex over time according to recent studies. Learn how to buck the trend by creating fast, accessible CSS forms that work with modern browsers and gracefully degrade. more »

Bookend Lists: Using CSS to Float a Masthead

Learn how to create that 'bookend' look with lists and CSS positioning. This CSS-layout technique saves a significant amount of XHTML code over tables. more »

Cut the Comments

Eliminating comments within your HTML, CSS, and JavaScript code helps optimize your web pages for maximum speed. more »

Size Images with Width and Height Attributes

Using width and height attributes on images ensures fast webpage display. Conserve bandwidth by using actual size for thumbnail images. more »

Convert Graphic Text to Styled Text

Converting graphic text to CSS text speeds up your site, makes it more accessible, and search engine friendly. more »

Use Short Relative URLs

Using short, relative urls saves space, speeds page display, and eases migration headaches. The little-used relative base element can save even more space. Learn how to avoid long URLs while making search engines and IAs happy. more »

Abbreviate URLs with mod_rewrite

We look behind the screens at Yahoo and Webreference to see how using short abbreviated URLs and mod_rewrite can save space for maximum speed. more »

Rewrite URLs with Content Negotiation

Content negotiation can make your URLs shorter and more abstract. By rewriting URLs without file extensions to the right resources you can save bytes and migration headaches. more »

Use Lowercase Markup For Better Compression

You can improve HTTP compression by using all lowercase markup. We test five popular sites for improved compression. Remember, all characters are not created equal. more »

XHTML: Omit Redundant Classes and Default Attributes

Omitting redundant classes and default attributes shrinks xhtml code to speed page response times. Many tags and duplicate attributes can be safely removed with no change in appearance. more »

XHTML: Layer Tables and Divs

By layering your content you can display useful content quickly to make your pages appear faster. Feedback can increase your users' pain threshold for delay. more »

XHTML: Use Structural Markup

By using purely structural XHTML markup you can easily target your content with CSS selectors. more »
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Last modified: February 26, 2015.

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