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Average Web Page Size Triples Since 2003

Within the last five years, the size of the average web page has more than tripled, and the number of external objects has nearly doubled. While broadband users have experienced somewhat faster response times, dial-up users have been left behind. 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 »

The Cost of Banner Advertising on Web Performance

The cost of banner ads for the average website is about one-sixth more objects and one-third more latency. Learn how online advertising affects web page response times, user behavior, and satisfaction. more »

Optimize Parallel Downloads to Minimize Object Overhead

With the average web page growing past 50 external objects, object overhead now dominates most web page delays. Increasing parallel downloads by using multiple hostnames can realize up to a 40% improvement in web page latency. more »

Use Delta Encoding to Compress RSS newsfeeds

Learn how to use delta encoding to compress your RSS XML newsfeeds. Save bandwidth by using delta compression for your RSS files. more »

Suture CSS or JavaScript Files to Reduce HTTP Requests

Learn how to "suture" CSS or JavaScript files together before delivery from the server to save HTTP requests. You'll have your organization and eat it too with this server-side approach to merging files. 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 »

Mono-Image CSS Rollovers

Learn how to create menu rollovers with different graphic backgrounds with one image. Save HTTP requests by combining on and off images into one mini-sprite and position with CSS. more »

Minimize Noise to Maximize Graphic and Video Compression

Noise is the enemy of efficient multimedia optimization. Learn how to minimize the noise in your images and videos to maximize compression. more »

Web Video Optimization Tips

Optimizing web videos has become more important as the use and size of videos has increased on the Web. Learn some best practices to help optimize your videos. more »

Home Page Usability and Credibility Survey

A usability survey revealed that high growth companies are not evaluating and improving their home page designs in a systematic way. By comparing the home pages of the Fortune 30 against Inc Magazine's fastest growing companies, researchers from Minnesota State University found the Fortune 30 had a usability score over 36% higher than the fast growing companies. more »

Replace GIF with PNG Images

PNGs are designed to be a more efficient, flexible, and patent-free replacement for GIFs. By replacing your GIFs with PNGs you can speed up your web pages and save bandwidth. more »

Book Preview: Information Foraging Theory

We interview today's digital Darwin Peter Pirolli, summarizing his revolutionary new book Information Foraging Theory. Hungry minds are foraging for valuable information on the Web. Learn how to boost your website's information scent or risk becoming a missing link. more »

Automated Color Harmony Tools

Make your designs sing in four-part color harmony with these automated color harmonization tools. We review a joint effort by Microsoft and Tel Aviv University to automatically enhance the color harmony of an image. more »

Don't Let the Graphics Grinch Steal Your Christmas Bonus

Know what jolly old site owners get when they let their graphics get so plump they shake like a bowl full of jelly? A lump of coal for Christmas. Let our Rudolph guide your way to a merry Christmas and happy New Year with an inspirational rendering of 'Twas the night before Christmas. more »

The Interactive Effects of Website Delay, Breadth, and Familiarity

A recent study examined whether website delay, breadth, and familiarity have interactive effects on user psychology and performance. A significant three-way interaction among all three factors showed that the ill effects of delay can be dampened by familiarity and breadth. Developers are urged to consider site familiarity, breadth, and delay together rather than separately. more »

Use a Web Accelerator

We review google web accelerator to see how well it speeds up web browsing. Web accelerators speed up web browsers with look-ahead caching, http compression, and proxy servers. This tutorial includes webmaster information. more »

Optimize PDF Files

We review Acrobat 8 Professional (pre-release) and PDF Enhancer 3.1 for optimizing PDF files. The new Acrobat features faster operations, smaller PDFs, a new interface, and the ability to combine different types of files into one PDF. Learn how to use PDF optimization tools to remove redundancies, subset and outline fonts, and compress text and images for faster downloads and higher user satisfaction. more »

Clickstream Study Reveals Dynamic Web

A new browser study revealed a shift in how we interact with the Web. University of Hamburg researchers found the Web moving from static hypertext information to dynamic interactive services. Clickstream heatmaps and web page statistics show rapid interaction over smaller areas of the screen. The authors recommend that web developers create concise, flexible, and fast loading web pages to keep pace with the speed of web navigation. 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 »

CSS Overlays: Using CSS Positioning to Overlay Web Objects

Learn how to create an eye-catching overlay with CSS positioning. This CSS-layout technique is faster than image slicing requiring fewer HTTP requests. 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 »