go
package main

import (
    "net"
)

func main() {
    l, err := net.Listen("tcp", ":1234")
    if err != nil {
        panic(err)
    }
    for {
        c, err := l.Accept()
        if err != nil {
            panic(err)
        }
        go func() {
            defer c.Close()

            var buf [4096]byte
            c.Read(buf[:])
            c.Write([]byte("HTTP/1.0 200 OK\r\nContent-Length: 5\r\n\r\nhello"))
        }()
    }
}

performs like 2x better than iouring (even with GOMAXPROCS=1)...