At work we have this timecard management system that's an enormous pain to use. All the bottom rung employees hate it because it's anything but intuitive. For example, it has stupid things like weekdays sorted alphabetically and a scroll bar to select the day of the month in a form. It's like the interfaces were tested exactly one time and never visited again, so long as it works minimally.

What's this crappy app have to do with big web pages? That application is awful for us worker bees, but management loves it because it produces nice reports. Management is the real customer for which the product is optimized. Similarly, many web pages are awful because they're mainly rated on how it looks. Nobody is including how fast it loads in the contract, and at the product demo you bet those resources are cached in the browser.

Ask yourself: who with the money in hand is actually looking at how fast the page loads on a slow connection or low-end devices?

TLDR: Looks > performance.