A slow website has useless HTTP requests, useless bloated content in those request, inefficient or useless computations and DOM changes, and even animation dela

A slow website has useless HTTP requests, useless bloated content in those request, inefficient or useless computations and DOM changes, and even animation delays and other types of intentional slowdown on the critical path: it is designed wrong and decent developers should try to do better, regardless of what frameworks were used or not to make it bad and whether lack of communication between front end and back end teams is behind the problems. The interesting question, then, is what horribly wrong incentives are at work to make web developers accept slow sites (and other trends of bad design like "dark UI patterns" and data collection).