More thoughts on the lack of a performance culture, prompted by the existence of Facebook Instant:
In my experience, the biggest barrier to a high-performance web is this: the means of production are far removed from the means of delivery. It’s hard to feel the performance impact of your decisions when you’re sitting on a T3 line in front of a 30 inch monitor. And even if you test on real devices (as you should), you’re probably doing it on a fast wifi network, not a spotty 3G connection. For most of us, even the ones I would describe as pro-performance, everything in the contemporary web design production pipeline works against the very focus required to keep the web fast.