I've been using computers for 4 decades. They have gotten no faster. The nuclear plant computer system we built in 1989 had to present selected screens in 1 second. I don't think any apps I use today can do that.
At some point, probably in the 1980s, people probably decided that computers could update UI fast enough, so any additional compute power or speed has been used for other things like making it prettier or reducing development effort or time, and now ai
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It’s all incentives. I’ve worked on web projects where the people in charge cared about performance. It’s easy to get sub second speeds if you start with that goal.
I’ve also worked on projects where the people in charge added 1mb client-side mapping libraries to render a static map and ignored my push back. Those website were slow