Following on from Ed's "Automatic versioning of CSS, JavaScript and Images" here is a method to version filenames based on modification times to be used in Django as a template tag. This is really handy technique for when you set expires headers to a long way into the…
.htaccess files are often used because they allow quick changes to the apache web server configuration and don't require apache to be restarted. However with this flexibility comes a number of performance implications and as a result they should be avoided unless you have absolutely no other way to put…
I've recently been building a simple framework for testing the performance of arbitrary JavaScript code. Whilst doing so I was looking at the some information on setTimeout in "JavaScript the Definitive Guide" by David Flanagan. One paragraph made me think of the DOMContentLoaded Problem: "In practice, setTimeout() tells…
Ed and I have been busy putting the final touches on our CSS Sprite creation tool which is now available over at http://spritegen.website-performance.org For the uninitiated, a CSS Sprite is a single image file which contains several graphics. Using CSS background positions it's possible to display any…
One of my colleagues Ed, has come up with a really useful PHP script that makes it trivial to concatenate and version css or js files on your site. What it does is takes an array of the files you wish to join together and it will create a versioned…