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Link to original content: http://developer.mozilla.org/en-US/docs/Glossary/Perceived_performance

Perceived performance - MDN Web Docs Glossary: Definitions of Web-related terms | MDN

Perceived performance

Perceived performance is a measure of how fast, responsive, and reliable a website feels to its users. The perception of how well a site is performing can have more impact on the user experience than the actual load and response times.