eiows

eiows is a high-performance WebSocket engine for Node.js, designed as a drop-in replacement for the ws module in Socket.IO applications. Version 9.2.0 provides significant performance and memory-usage improvements but is only compatible with Node.js (v16 to <27) and runs exclusively on Linux, FreeBSD, and macOS. It requires engine.io 3.4.2 or higher and the system must have Git installed for native compilation. Compared to ws, eiows offers better scalability for WebSocket-heavy applications while maintaining API compatibility.