Swoole (module) is extremely performant in anything networking, including as a websocket server. There are other php-only options (amphp/websocket-server, ratch

Swoole (module) is extremely performant in anything networking, including as a websocket server. There are other php-only options (amphp/websocket-server, ratchetphp/Ratchet) but if performance is your need, stick with swoole.