Web Performance Optimization Blog
Web performance optimization is abou making your site faster. It's important. Do it!
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Participate in the 5-question Web Performance Quiz and maybe you will win the free 2-day conference pass for Velocity!
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Defer loading third party (async) scripts until after onload, for better, more meaningful page load time data.
Come to the best Web Performance and Operations conference in Europe (Berlin, Nov 8-9). Register now for Velocity Europe with a 20% discount!
The performance of the Google +1 Button is disappointing. It has a strong negative effect on page load time. I describe the problems and provide a (partly) solution.
Test how fast your site loads on an iPhone in The Netherlands. You can even record a video to see how it loads!
Want to win a free pass to the best Web Performance & Operations conference in the world, June 14-16 in Sillicon Valley? Play the Web Performance Quiz!
IE9 is different from IE8 when it comes to performance. This checklist sums up many (all?) IE9 specific performance issues and changes.
When loading a script dynamically, callback code may get executed twice in IE9, like in Steve Souders' Script Onload technique. The solution is simple.
An overview of different ways to use an iframe for loading content, ads & widgets and how it affects site performance. Web devs: pay special attention to the Dynamic Asynch Iframe. It's awesome and you may have not heard about it before.
A single Google Adsense ad increases page load time by approx. 0.4 seconds. Understand why and find out how to easily solve this problem, today.
Improve the perceived load time and user experience by sending the first part of the HTML document - with the @font-face declaration - to the browser early.
Note: this article needs an update. The concept is still valid, but it needs more testing.