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The User Experience Rating (UXR) is a metric that correlates IT end-user experience with application wait times. UXR is the ratio of wait time to active time, represented as a percentage. It was introduced in 2014 by Logfiller,[1] to describe a key attribute of desktop computing, a feature of their software product, Layer8.
UXR is a concept currently applied to all Windows-based systems,[2] but generically applicable to any device with a measurable UI wait state.