Performance

react-native-nitro-unzip is designed for speed. Here's how it performs and why.

Benchmarks

Tested on a 350MB archive with 10,432 small files (map tiles):

Platform	Speed	Time
iOS (iPhone)	~500 files/sec	~20s
Android	~474 files/sec	~22s

SSZipArchive uses C-based libz decompression with streaming extraction, avoiding memory overhead from loading the entire archive into memory.

The Android implementation uses several optimizations:

64KB I/O buffers — 8x the default buffer size, reducing system call overhead
Batch directory creation — creates directory trees in bulk rather than one at a time
Buffered streams — wraps all I/O in buffered streams for efficient reads and writes

JSI callbacks — progress updates go through JSI (JavaScript Interface), bypassing the React Native bridge entirely. No serialization or deserialization overhead.
Throttled updates — progress callbacks fire at most once per second, so even archives with thousands of files don't flood the JS thread.
Background execution — extraction runs on native background threads, keeping the UI responsive.