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As our expectations for mobile experiences change, so does our understanding of performance. People expect web apps to feel just as snappy and responsive as native apps, regardless of their current network coverage. Perceived performance is a measure of how fast something feels to the user. The idea is that users are more patient and will think of a system as faster if they know what's going on and can anticipate content before it's actually there. It's a lot about managing expectations and keeping the user informed. For a web app, this concept might include displaying "mockups" of text, images or other content elements - called skeleton screens π. You can find these in the wild, used by companies like Facebook, Google, Slack and others.
