How to fast the data transfer rate with WebSocket module 'ws' in Espruino?

@Gordon
I run the codes on ESP32 module.

As in the 'net' codes, the ESP32 module can transfer 230bytres in 4~6ms with WiFi.

connected? err= null info= {
  "ip": "192.168.1.30",
  "netmask": "255.255.255.0",
  "gw": "192.168.1.1",
  "mac": "30:ae:a4:03:96:a8"
 }
connected
Packet NO.: 1, time used: 0.004231s
Packet NO.: 2, time used: 0.006114s
Packet NO.: 3, time used: 0.004296s
Packet NO.: 4, time used: 0.004198s
Packet NO.: 5, time used: 0.004113s
Packet NO.: 6, time used: 0.005927s