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Not only that but latency is introduced artificially to make users feel more confident about changes they've made.

https://uxmag.com/articles/let-your-users-wait

https://www.fastcompany.com/3061519/the-ux-secret-that-will-...

If the app or site isn't trying to sell me something then I don't see the draw. I understand the research around the marketing aspect but if I've already paid for something using a sleep() doesn't seem like it would make me trust something. I think I would rather ask why something is so slow (and doubly-so for anything on-prem which should be fast!).

If research shows users aren't sure if something happened then fix the UI to give some feedback to the user that their action was registered. This will likely involve a small delay even if it's just in the user's perception of the feedback but less than presented in the articles.

It's been much too long since I've run or participated in a UX study so maybe it's a good time to get back into it.

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