I agree, but I would say that Google are performance addicts because of their scale, where seconds actually count. Most apps are never going to be 'web scale',

I agree, but I would say that Google are performance addicts because of their scale, where seconds actually count. Most apps are never going to be 'web scale', and most of the time there's no trade off to make. Either the devs use libraries to make something work fast and live with a big js bundle, or they optimise too early and go down the perf rabbit hoe and run out of runway. If your product is of enough value your customers aren't going to care about 1-2 seconds, and if it becomes an issue you can do the perf work later.