RIO (Ryosuke Shimizu) KMP × Kotlin 2.3 How Android Got Slower While iOS Builds Improved by 47% 

Self Introduction My name is RIO @rioX432 ・Disney ・Chiikawa ・HoloLive ・Game Streaming ・Comfy UI　etc RIO / Mobile App Engineer Avvy Avatar Live Streaming App 

Sharing Domain Logic with KMP Developing the live streaming app Avvy persona-domain-kmm Sharing 25 Repositories / 33 UseCases For iOS XCFramework ↓ SPM Distribution For Android AAR ↓ GitHub Packages Distribution 

Challenges Before Upgrade Slow XCFramework Builds Average 14.3 min, Max 28 min Delays iOS integration after KMM merges • • AGP Compatibility Chain AGP 9 requires Kotlin 2.2.10 Called a "Disaster" on Reddit 219 upvotes) Complete DSL revamp, Variant API removed, KMP coexistence restricted • • • Blocked Dependencies Kotlin 2.0.20 environment QRCode and Kase64 require Kotlin 2.1, preventing updates • • 

XCFramework ビルドが遅い 平均 14.3分、最大 28分 KMMマージ後のiOSへの 取り込みが遅れる • • AGP互換性の連鎖 AGP 9がKotlin 2.2.10を要求 Redditで "Disaster" と呼ばれる （219 upvotes） DSL全面刷新、Variant API 廃止、KMP共存制限 • • • 依存ライブラリが ブロック Kotlin 2.0.20環境 QRCode, Kase64がKotlin 2.1を 要求しアップデート不可に • • 

Upgrade Details Library Before After Kotlin 2.0.20 2.3.20 Ktor 2.3 3.4 AGP 8.5 8.13 Gradle 8.9 8.13 

iOS: 47% Speedup Measured across 87 GitHub Actions runs Highly reliable improvement results based on actual measurement data 

iOS: Why It Got Faster linkReleaseFramework sped up by 46% from 7m 38s to 4m 07s The most critical step, accounting for 90% of the total build time 

But for Android... 

Android: Why It Got Slower compileKotlin 30s 43% K2 JVM regression / YouTrack KT81883 Unresolved) Configuration 26s 32% KSP remains almost unchanged → Not caused by Ktor 3 

Android: Why It Got Slower 

Summary Kotlin 2.3 is a must-have for KMP projects iOS ↓47% — Huge impact, cutting CI time in half Android: ↑30s — Acceptable trade-off, waiting for KT81883 fix Stay ahead of the curve for the AGP 9 migration Understand the trade-offs 

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