carbon.txt – What is it and why should you care?Similar to the better known robots.txt file, the carbon.txt file is also a txt file located on your webserver. This text file is meant to keep information about the resources used to serve your website and information related to your own carbon footprint. In other words, it is a convention for website owners and digital service providers to demonstrate that their […]
I was listening to a webinar the other day about RUM (Real User Monitoring). Through RUM, it was clear that iPads performed worse than iPhones and desktops on a given site. Performance meaning general speed of rendering. Speculation among the audience was that if this is because iPads are generally older than smartphones and for that […]
I was tempted to call this blog post “Responsive Images is Fool’s Gold”, just like Jason Grigsby did but for Media Queries for mobile a while back. That post created a lot of buzz of course. The Responsive Images specification deserve some debate too because, just like when media queries for mobile was a hype, […]
Had the pleasure of speaking at Velocity Europe in London. A great conference that gather lots of smart people interested in web and performance. Thank you for having me! Here are the slides from my talk. Velocity EU: Give Responsive Design a Mobile Performance Boost from Jon Arne Sæterås
A national newspaper in Norway just recently traveled around Oslo to test 4g speed. They tested Telenor and Netcom with a Samsung Galaxy 4 Active using the app Ookla Speedtest. Even if this is not an extensive test, I think this illustrate the connectivity dimension quite well. Connectivity on mobile devices is dramatically different from […]
A web page in 2030 will weigh almost 320 Mb. The average mobile bandwidth globally will be 93 Mbps. Of course, this is not very likely to be true (well, who knows really…). Just for fun, I calculated the growth rate of an average web site from HTTP Archive (May 2012 to May 2013) and Ciscos […]
I had the pleasure of doing a talk on web performance on mobile devices at the Dutch Mobile Conference in Amsterdam last week. 45 minutes is way to little to dive into it all, but feedback says it was a good intro, and I am happy for that. I posted my slides at Slideshare.net. I […]