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Reddit improved app startup speed by over 50% using Baseline Profiles and R8
- Reddit's Android app developers used Baseline Profiles, R8 compiler, and Jetpack Compose to improve app performance and the user experience for existing and new users.
- The Reddit app developers used Baseline Profiles to build screen-specific performance metrics for critical user journeys like scrolling the home feed, logging in, launching the full-screen video player, navigating between subreddits and scrolling their feeds, and using the chat feature to improve metrics and enhance user experience.
- Early benchmarks after using Baseline Profiles for the first time for feeds showed a 51% improvement in median startup time and a 36% reduction in frozen frames' 95th percentile for the home feed.
- Additionally, the upgrade to R8 full mode led to an increase in Google Play average ratings, and R8 full mode also reduced total application-not-responding errors by almost 30%.
- After upgrading to the September 2024 release of Jetpack Compose, Reddit saw significant performance gains across the board. Cold start times improved by 13%, excessive slow frames decreased by 25%, and frozen frames dropped by 10%.
- Further optimizations were made using Jetpack Compose, which supported the adoption of the technology stack and enabled the teams to fix bugs quickly and improve overall app stability.
- The app saw 15% scroll performance improvements, widespread enhancements across lower-end devices and emerging markets, slow cold start improvements of 20%, a 10% reduction in excessive frozen frames and a 30% reduction in excessive slow frames.
- Jetpack Compose also drove improvements in both slow and frozen frame rates for the home feed, and scrolling performance improved visibly according to internal reviews.
- Overall, Reddit app developers using Baseline Profiles, R8 compiler, and Jetpack Compose have elevated the user experience by refining and optimizing the app with performance improvements.
- These performance improvements will be extended to other critical user journeys like Reddit’s post and comment experiences.
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