Kotlin Perfomance on Android

on YouTube ↗42m

" summary

Benchmarks on an animation-heavy Android app compare Kotlin vs Java across four phones and show Kotlin is not inherently slower: unoptimized Kotlin sometimes adds milliseconds to frame time but after targeted fixes median frame times match or beat Java. Concrete fixes: use @JvmField or private properties to get getfield instead of invokevirtual, avoid companion object indirections, prefer index-based for-loop over iterator for ArrayList, watch boxing and null-assert checks, and run ProGuard/ Redex — results: APK size down ~7% and frame latency parity.

AI-written summary · about

" chapters (11)

1. 0:00Introduction
2. 3:17Android benchmarking
3. 6:28Kotlin vs Java performance
4. 13:05Optimizing properties and fields
5. 17:01Static methods in Kotlin
6. 21:41Nullability checks
7. 24:11Primitives and autoboxing
8. 28:10Loop optimization
9. 32:23Practical benchmarks
10. 39:26Summary and recommendations
11. 40:51Q&A

" related talks

• 34mPerformance in a Kotlin worldSean McQuillan, Dan Galpin · droidcon NYC 2019
• 45mPerformance in a Kotlin worldSean McQuillan · Chicago Roboto 2020
• 47mPerformance in a Kotlin WorldSean McQuillan · Android Summit 2019
• 41mKotlin's hidden costs, revisitedChristophe Beyls · Android Makers 2018
• 37mImproving app performance with benchmarkingDustin Lam, Chris Craik · Google I/O 2019
• 43mPerformance in a Kotlin WorldSean McQuillan · droidcon SF 2019
• 38mKotlin High-Performance ProgrammingOhmae Ryosuke · DroidKaigi 2023
• 49mKotlin on Android (en)Svetlana Isakova · Droidcon Paris 2015