Ethan Marcotte paints things in a different light by looking at business incentive:

…ultimately, the web’s performance problem is a problem of profitability. If we’re going to talk about bloated pages, we should do so in context: in the context of a web where digital advertising revenue is cratering for publishers, but is positively flourishing for Facebook and Google. We should look at the underlying structural issues that incentivize a company to include heavy advertising scripts and pesky overlays, or examine the market challenges that force a publisher to adopt something like AMP.

In other words, the way we talk about slow websites needs to be much, much broader. If we can do that, then we’ll have a sharper understanding of where—and how—the web can be faster.