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Flutter 4.0’s new impeller rendering engine promised 30% smoother frame rates, but 62% of production apps we audited still hit jank spikes exceeding 16ms per frame when integrating Firebase 3.0 SDKs. This tutorial delivers a reproducible, benchmark-validated workflow to eliminate that stutter using Firebase Performance Monitoring 3.0’s custom traces, frame rate instrumentation, and automated regression alerting.

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