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

@Gordon
Your code enhance the performance of 'ws' aobut five times.

in the 'ws' codes:

    var mask = [];
    for (var ix = 0; ix < 4; ix++){
      var rnd = Math.floor( Math.random() * 255 );
      mask[ix] = rnd;
      //masked += strChr(rnd);
    }
    var masked = new Uint32Array(1+((msg.length+3)>>2));
    var m8 = new Uint8Array(masked.buffer, 0, (4 + msg.length));
    m8.set(mask,0);
    m8.set(msg,4);
    var m = masked[0];
    for (var i=1;i<masked.length;i++) {
      masked[i]^=m;
    }
    // E.mapInPlace could be even faster here
    this.socket.write(m8);

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: 0.122781s
Packet NO.: 2, time used: 0.130532s
Packet NO.: 3, time used: 0.130694s
Packet NO.: 4, time used: 0.121443s
Packet NO.: 5, time used: 0.122264s
Packet NO.: 6, time used: 0.128198s
Packet NO.: 7, time used: 0.118977s
Packet NO.: 8, time used: 0.128156s
Packet NO.: 9, time used: 0.126372s
Packet NO.: 10, time used: 0.128605s
Packet NO.: 11, time used: 0.123227s
Packet NO.: 12, time used: 0.129712s
Packet NO.: 13, time used: 0.122637s
Packet NO.: 14, time used: 0.128667s
Packet NO.: 15, time used: 0.123411s
Packet NO.: 16, time used: 0.122551s
Packet NO.: 17, time used: 0.130601s
Packet NO.: 18, time used: 0.124756s
Packet NO.: 19, time used: 0.130782s
Packet NO.: 20, time used: 0.125312s
Packet NO.: 21, time used: 0.125905s
Packet NO.: 22, time used: 0.142719s
Packet NO.: 23, time used: 0.127608s
Packet NO.: 24, time used: 0.126586s
Packet NO.: 25, time used: 0.127527s
Packet NO.: 26, time used: 0.131625s
Packet NO.: 27, time used: 0.134015s
Packet NO.: 28, time used: 0.13283s
Packet NO.: 29, time used: 0.132503s
Packet NO.: 30, time used: 0.125586s
Packet NO.: 31, time used: 0.134384s
Packet NO.: 32, time used: 0.133459s
Packet NO.: 33, time used: 0.128191s
Packet NO.: 34, time used: 0.12743s
Packet NO.: 35, time used: 0.133592s
Packet NO.: 36, time used: 0.134646s
Packet NO.: 37, time used: 0.132336s
Packet NO.: 38, time used: 0.128793s
Packet NO.: 39, time used: 0.137423s
Packet NO.: 40, time used: 0.128829s
Packet NO.: 41, time used: 0.127535s
Packet NO.: 42, time used: 0.135589s
Packet NO.: 43, time used: 0.129962s
Packet NO.: 44, time used: 0.135888s
Packet NO.: 45, time used: 0.127731s
Packet NO.: 46, time used: 0.13064s
Packet NO.: 47, time used: 0.135926s
Packet NO.: 48, time used: 0.135231s
Packet NO.: 49, time used: 0.135276s
Packet NO.: 50, time used: 0.137039s
Packet NO.: 51, time used: 0.136779s
Packet NO.: 52, time used: 0.132308s
Packet NO.: 53, time used: 0.130578s
Packet NO.: 54, time used: 0.130833s
Packet NO.: 55, time used: 0.145101s
Packet NO.: 56, time used: 0.134404s
Packet NO.: 57, time used: 0.138408s
Packet NO.: 58, time used: 0.132389s
Packet NO.: 59, time used: 0.146416s
Packet NO.: 60, time used: 0.136446s
ERROR: Out of Memory!
ERROR: Ctrl-C while processing interval - removing it.
Execution Interrupted during event processing.
at line 1 col 461
...[f]^=i;this.socket.write(c),e=undefined,b=undefined,c=undefi...
                              ^
in function "send" called from line 2 col 23
        ws.send(packet);
                      ^
in function called from system

What strange is that after 60 packets are transfered, the program throws " out of memory " error, every time.

AND , when the server receives the second packet, it crashed every time.

Server is listening on port 5004
a client connected
isTalking : false
<Buffer 81 fe>
received data: 1,230
<Buffer 35 38>
events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: invalid opcode: 5

The first two bytes of the first packet is correct, and that of the second packet is wrong. The first tow bytes of the second(and every frame/packet) should be , but they are now.

The error is throwed by the codes in Receiver.js of ws module on nodejs

if ((buf[0] & 0x30) !== 0x00) {
      this.error(new Error('RSV2 and RSV3 must be clear'), 1002);
      return;
    }

I'll try to find the problem.