You Own Your Data, in Spite of the Cloud

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The user interface may try to hide that latency by showing the operation as if it were complete, even though the request is still in progress — a pattern known as [Optimistic UI] — but until the request is complete, there is always the possibility that it may fail (for example, due to an unstable Internet connection). Thus, an optimistic UI still sometimes exposes the latency of the network round-trip when an error occurs. (View Highlight)