November 10th, 2010
Data URIs are one of the best techniques in CSS, allowing developers to avoid referencing external images and instead embed them directly into a stylesheet. The main advantage of this approach is to save HTTP requests.
HTTP requests are a huge performance bottleneck, and the reason techniques such as CSS image sprites have been popular for some time. Basically, if you can avoid requesting an extra file, not only does it save your server the work of looking up the file, but it also saves your user the download time. In fact, HTTP request management is so important, that it is the top issue in the Yahoo Performance Rules.
Data URIs are an excellent way to reduce HTTP requests and speed up your pages, so let’s walk through how to use them in all major browsers.
October 21st, 2010
Reducing Calls To The Language API
Although fairly … Read more…
February 10th, 2010
1. Define local variables
Simply put, the deeper the engine has to dig into this … Read more…
December 8th, 2009
Installing TranslateThis couldn’t be easier—simply copy and paste the widget code anywhere on your website, you don’t have to upload any files or change any settings.
What can you customize in TranslateThis?
November 19th, 2009
There were a lot of good speakers at today’s jQuery Summit, but Paul Irish‘s talk on jQuery Anti-Patterns for Performance & Compression was my stand-out favorite. Covering a number of advanced jQuery performance optimization techniques, this speech put my knowledge of jQuery optimization to shame.
Before Paul’s talk my understanding of jQuery performance tuning was fairly simplistic:
- Optimize selectors to descend from an id if possible.
- Use tag names when selecting classes and don’t use an excessive number of selectors.
- Define variables instead of selecting the same object repeatedly.
- Optimize your code replacing repetition with object oriented functions.
But the information Paul presented blew all that out of the water. Here are 10 jQuery performance rules I gathered from his presentation:
1. Optimize selectors for Sizzle’s ‘right to left’ model
July 13th, 2009
I’m happy to announce the release of QuickFlip 2, a major reworking of the jQuery plugin that flips any piece of HTML markup over like a card. The new version is faster and even easier to use—simply call the flip animation through a jQuery selector and the QuickFlip will flip the front panel to show its back. The flip effect is similar to the UI animation on the iPhone
Download QuickFlip 2 for jQuery
Read the QuickFlip documentation
QuickFlip works by using an animation shortcut that is barely noticeable when flipped quickly (hence the name). This shortcut improves performance while allowing the flip effect to work smoothly with any piece of markup regardless of images, backgrounds or CSS.
It provides an attractive alternative to other slower and more resource heavy Flash and jQuery flip animations. However if you want a smoother option with … Read more…
June 2nd, 2009
Scrolling Parallax is a new jQuery plugin that binds a parallax effect to the scrollbars and mouse wheel. This allows a background image or anything else to scroll at a different pace than the web page when a user scrolls around. The parallax effect that results is an easy way to create an illusion of depth on your website.
Basic use of the Scrolling Parallax plugin is extremely easy. Simply pass the path to an image, and the plugin takes the image and stretches it to the window width and 150% of the height. The extra 50% of the height is scrolled down along with the document, smoothly reaching the end at the same time as the page.
The Scrolling Parallax plugin is also very versatile. There are a wide variety of options including scrolling faster, slower, looping and reversing the animation and tiling the … Read more…
August 18th, 2008
Up and Down to move, Left and Right to skate faster or slower, Spacebar to jump
I’m fairly pleased with the performance, which is vastly improved through the use of cell-based collision detection. Instead of having to check for collision every pixel, it can be checked every 32, with huge processing savings. Additionally, the use of CSS sprites greatly reduces the number of HTTP requests and the need to use … Read more…
July 10th, 2008
1. Beware of class-only selectors
June 13th, 2008