How Uber improves Performance Profiling on iOS
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Uber's iOS app startup metrics became 130% inflated overnight. The culprit? iOS 15's pre-warming feature broke their entire measurement system.
Uber's Android team hit a wall: their profiling tools were either too slow or too inaccurate to debug real performance issues.
Uber operates across 600+ cities on 4,500+ mobile carriers. Their HTTP/2 stack was failing users in lossy wireless networks.