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#frontend and #fullstack devs: Be optimistic about API calls. Research has shown that as little as 100ms of delay is the time it takes for a user to go from perceiving they did something to perceiving they are waiting on something. And 250ms is enough for them to be upset about it.

I've seen too many instances where the UI doesn't update til the API call returns or a #signalr event comes back. If you can anticipate a response, let the UI assume it will succeed for the best UX that feels "magic"