Google • Ben Weiss • Nov 21, 2025

Fully Optimized: Wrapping up Performance Spotlight Week

Article Summary

Ben Weiss and Sara Hamilton from Google wrap up Performance Spotlight Week with a roadmap to faster Android apps. Reddit cut ANR errors by 30% with one configuration change.

Google's Performance Spotlight Week delivered five days of optimization guidance for Android developers. The series covered everything from R8 optimizer best practices to Jetpack Compose performance improvements, culminating in a comprehensive performance measurement framework. This wrap-up post serves as your index to all the resources shared.

Key Takeaways

Reddit achieved 40% faster cold startup by enabling R8 full mode
Disney+ removed one flag (dontoptimize) and saw significant performance gains
New Performance Leveling Guide breaks measurement into five progressive steps
Android Studio Narwhal now auto-deobfuscates stack traces in Logcat
Baseline Profiles improved Meta's app metrics by up to 40%

Critical Insight

Enabling R8 full mode and using Profile Guided Optimizations are the highest-impact, lowest-effort changes you can make to improve Android app performance.

The new Background Task Inspector reveals why your WorkManager tasks are delayed, plus there's a hidden lint check that catches overly-broad Keep Rules before they cause problems.

About This Article

Problem

Android developers lack a clear way to measure app performance systematically. They struggle to prioritize optimization work across multiple metrics and tools.

Solution

Google created the Performance Leveling Guide, a five-step measurement framework. It starts with Android Vitals data and moves into advanced local testing using Jetpack Macrobenchmark and UiAutomator 2.4 API.

Impact

Developers now have a structured path from field data they already have to precise local performance checks. This makes it easier to find optimization opportunities that will actually move the needle.