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

The test codes using 'net' module on Esp32. very fast.

function onInit(){

  var ssid = "HGiga3";
  var wifiOpts = {password:"20071203"};
  var wifi = require("Wifi");

  wifi.connect(ssid, wifiOpts, function(err){
    console.log("connected? err=", err, "info=", wifi.getIP());

    var client = require("net").connect({host: "192.168.1.9", port: 5004}, function() {
      console.log("connected");
      //ws.send('hello, server');
      var packet = "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890";
      var pktNum = 0;
      var ta = 0;
      var id = setInterval(function(){
        var t1 = getTime();
        client.write(packet);
        pktNum ++;
        console.log("Packet NO.: " + pktNum + ", time used: " + (t2 = getTime() - t1) + "s");
        ta += t2;
        if(pktNum >=101){
          console.log("total time used: " + ta +"s");
          clearInterval(id);
        }
      }, 0);
    });
  });

} // END OF : function onInit(){

result:

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
Packet NO.: 7, time used: 0.004045s
Packet NO.: 8, time used: 0.004094s
Packet NO.: 9, time used: 0.006462s
Packet NO.: 10, time used: 0.004759s
Packet NO.: 11, time used: 0.004114s
Packet NO.: 12, time used: 0.007091s
Packet NO.: 13, time used: 0.006509s
Packet NO.: 14, time used: 0.004279s
Packet NO.: 15, time used: 0.005615s
Packet NO.: 16, time used: 0.004196s
Packet NO.: 17, time used: 0.003922s
Packet NO.: 18, time used: 0.004579s
Packet NO.: 19, time used: 0.003968s
Packet NO.: 20, time used: 0.003939s
Packet NO.: 21, time used: 0.004289s
Packet NO.: 22, time used: 0.004283s
Packet NO.: 23, time used: 0.003999s
Packet NO.: 24, time used: 0.003984s
Packet NO.: 25, time used: 0.004023s
Packet NO.: 26, time used: 0.004017s
Packet NO.: 27, time used: 0.004048s
Packet NO.: 28, time used: 0.004591s
Packet NO.: 29, time used: 0.004092s
Packet NO.: 30, time used: 0.004068s
Packet NO.: 31, time used: 0.00434s
Packet NO.: 32, time used: 0.004269s
Packet NO.: 33, time used: 0.004151s
Packet NO.: 34, time used: 0.004142s
Packet NO.: 35, time used: 0.004177s
Packet NO.: 36, time used: 0.004166s
Packet NO.: 37, time used: 0.004199s
Packet NO.: 38, time used: 0.004697s
Packet NO.: 39, time used: 0.00427s
Packet NO.: 40, time used: 0.004582s
Packet NO.: 41, time used: 0.00449s
Packet NO.: 42, time used: 0.004288s
Packet NO.: 43, time used: 0.004275s
Packet NO.: 44, time used: 0.004271s
Packet NO.: 45, time used: 0.004327s
Packet NO.: 46, time used: 0.004298s
Packet NO.: 47, time used: 0.004333s
Packet NO.: 48, time used: 0.005087s
Packet NO.: 49, time used: 0.004388s
Packet NO.: 50, time used: 0.004353s
Packet NO.: 51, time used: 0.004907s
Packet NO.: 52, time used: 0.004524s
Packet NO.: 53, time used: 0.00496s
Packet NO.: 54, time used: 0.00446s
Packet NO.: 55, time used: 0.00546s
Packet NO.: 56, time used: 0.005477s
Packet NO.: 57, time used: 0.00445s
Packet NO.: 58, time used: 0.004393s
Packet NO.: 59, time used: 0.004385s
Packet NO.: 60, time used: 0.004417s
Packet NO.: 61, time used: 0.004403s
Packet NO.: 62, time used: 0.004368s
Packet NO.: 63, time used: 0.004339s
Packet NO.: 64, time used: 0.00434s
Packet NO.: 65, time used: 0.004344s
Packet NO.: 66, time used: 0.0043s
Packet NO.: 67, time used: 0.004294s
Packet NO.: 68, time used: 0.004246s
Packet NO.: 69, time used: 0.00437s
Packet NO.: 70, time used: 0.004324s
Packet NO.: 71, time used: 0.005413s
Packet NO.: 72, time used: 0.004527s
Packet NO.: 73, time used: 0.004495s
Packet NO.: 74, time used: 0.004142s
Packet NO.: 75, time used: 0.004123s
Packet NO.: 76, time used: 0.004212s
Packet NO.: 77, time used: 0.0057s
Packet NO.: 78, time used: 0.00406s
Packet NO.: 79, time used: 0.004445s
Packet NO.: 80, time used: 0.004121s
Packet NO.: 81, time used: 0.004131s
Packet NO.: 82, time used: 0.004038s
Packet NO.: 83, time used: 0.003966s
Packet NO.: 84, time used: 0.004073s
Packet NO.: 85, time used: 0.006238s
Packet NO.: 86, time used: 0.004172s
Packet NO.: 87, time used: 0.005971s
Packet NO.: 88, time used: 0.005622s
Packet NO.: 89, time used: 0.006437s
Packet NO.: 90, time used: 0.004657s
Packet NO.: 91, time used: 0.006027s
Packet NO.: 92, time used: 0.004347s
Packet NO.: 93, time used: 0.004164s
Packet NO.: 94, time used: 0.003917s
Packet NO.: 95, time used: 0.006005s
Packet NO.: 96, time used: 0.006223s
Packet NO.: 97, time used: 0.004181s
Packet NO.: 98, time used: 0.006128s
Packet NO.: 99, time used: 0.004149s
Packet NO.: 100, time used: 0.006002s
Packet NO.: 101, time used: 0.004063s
total time used: 0.465458s