A faster FT.com
Clever testing strategy from the team at Financial Times: they used blocking CSS in order to test people’s behaviour when they’re faced with a slow loading web page:
We wanted to understand how much the speed of our website affected user engagement, specifically, the quantity of articles read, one of our key measures of success. Using that data we then wanted to quantify the impact on our revenue.
If you’re looking for more interesting reading about performance and how it affects people’s behaviour, see the collection of case studies over at WPO stats.