WebAssembly Performance Benchmark 2025

May 15, 2025 • 8 min read

Introduction to Performance Testing

Our latest benchmark suite compares WebAssembly performance against JavaScript in real-world workloads. The tests were conducted using the latest stable WebAssembly implementations and JavaScript engines.

Key Performance Results

JavaScript

WASM

(Bars represent execution time for standard algorithm tests)

Performance Metrics Table

Operation	JS Time	WASM Time	Delta
Matrix Multiplication	284ms	82ms	3.46× faster
SHA-256 Hashing	9.4MB/s	12MB/s	28% faster
FFT 8192pt	314ms	82ms	285% faster

What This Means For Developers

WebAssembly remains 67-87% faster than JS in math operations
64-bit operations gain 3-285% performance uplift
Memory operations improve up to 80% in compression scenarios

Conclusion

WebAssembly continues to demonstrate significant performance advantages in compute-heavy applications. These benchmarks reinforce its role as the preferred solution for high-performance web applications.