Really depends on the application. WebAssembly can't use SIMD intrinsics and CPU-specific instructions besides simd128 and what the compiler can do. At least f

Really depends on the application. WebAssembly can't use SIMD intrinsics and CPU-specific instructions besides simd128 and what the compiler can do. At least for cryptography, WebAssembly can be very slow and can hardly provide any guarantee against side channels.