Question #369HardNative Android

Performance comparison of running production app in Java vs Kotlin vs Dart vs Jetpack Compose?

#performance#kotlin#java#flutter

Answer

Overview

Performance comparison across platforms and frameworks.

Runtime Performance

MetricJavaKotlinDart (Flutter)Compose
SpeedFastSame as JavaNear-nativeSame as Kotlin
Startup400ms400ms600ms450ms
MemoryBaselineSame+40%+10%
APK Size10MB10MB18MB11MB

Build Performance

TaskJavaKotlinComposeFlutter
Clean build30s35s45s50s
Incremental5s7s10s3s
Hot reload❌❌Limited✅ Fast

Memory Footprint

kotlin
// Typical app memory usage

// Java/Kotlin Native: 50-80MB base
// Kotlin + Compose: 60-90MB (+10-15%)
// Flutter: 80-120MB (+40-60%)

When to Choose

Java/Kotlin Native

  • ✅ Best performance
  • ✅ Smallest APK
  • ✅ Android-only

Jetpack Compose

  • ✅ Modern UI
  • ✅ Good performance
  • ✅ Android-only

Flutter

  • ✅ Cross-platform
  • ⚠️ Larger APK
  • ⚠️ Slower startup

Bottom Line: Native Android has best performance. Flutter trades performance for cross-platform capability.

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