Performance is about people, not metrics
summary
Survey of UX studies ties small delays to big human effects: Google‑linked research shows 100 ms matters for perception; lab work with EEG headsets finds users work 50% harder to stay on task when pages slow; a mobile replication increases load from 3–4s → 5–6s and records more frustration, lower engagement and rage clicks; Tealeaf session replays from 2011 show ~60% behave normally but ~4% report throwing their phone when an app is slow.
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