> There is even such a thing as too fast. If a user doesn't notice the page updated due to speed, that is also a poor experience. If you're relying on your app

> There is even such a thing as too fast. If a user doesn't notice the page updated due to speed, that is also a poor experience. If you're relying on your app's execution time to demonstrate this to a user, then you have poor UX. Instant changes and updates have been the norm in mobile apps forever and optimistic UI is becoming pretty standard on the web too, see Linear for example.