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Performance

Learn about the performance characteristics of expo-audio-stream and how to optimize your audio recording configurations.

Overview​

expo-audio-stream is built with performance as a core priority. The library has undergone significant optimizations to ensure fast, reliable audio recording across all platforms.

Key Performance Features​

  • Fast Stop Recording: < 200ms stop time for recordings of any duration
  • Efficient Memory Usage: Optimized buffer management for minimal memory footprint
  • Cross-Platform Consistency: Similar performance characteristics on Android and iOS
  • Real-Time Processing: Support for live audio analysis without impacting recording

Recent Performance Improvements​

Stop Recording Optimization (99%+ Improvement)​

A comprehensive performance analysis and optimization was completed, resulting in dramatic improvements:

  • Android: 92% improvement (1070ms → 124ms for 10-minute recordings)
  • iOS: 99.3% improvement (2554ms → 18ms for 10-minute recordings)
  • Cross-Platform Parity: Both platforms now perform identically well

Learn more about the optimization →

Performance Resources​

File Sizes Guide​

Understand how different recording configurations affect file sizes with real-world measurements.

Configuration Guide​

Choose the optimal settings for your specific use case:

  • Voice Recording: 16 kHz, Mono, 16-bit
  • Music Recording: 44.1 kHz, Stereo, 16-bit
  • Professional: 48 kHz, Stereo, 32-bit

Testing Your Performance​

You can validate performance in your own application using the agent validation workflow:

// Deep link to test specific configuration
const testUrl = 'audioplayground://agent-validation?sampleRate=44100&channels=2&encoding=pcm_16bit';

Continuous Performance Monitoring​

Performance is continuously validated through:

  • Automated E2E tests on real devices
  • Performance regression detection
  • Regular benchmarking across different configurations

All performance claims are backed by actual test data from real devices.