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

I write some test codes.

var strChr = String.fromCharCode;

var msg = "1234567890";

for(var lp=0; lp<8;lp++){
  // mask
  var mask = [];
  var masked1 = '';
  for (var ix = 0; ix < 4; ix++){
    var rnd = Math.floor( Math.random() * 255 );
    mask[ix] = rnd;
    masked1 += strChr(rnd);
  }

  // masked1:
  for (var ix = 0; ix < msg.length; ix++){
    masked1 += strChr(msg.charCodeAt(ix) ^ mask[ix & 3]);
  }
  // masked1 char code
  var masked1code = [];
  for(var i = 0;i<masked1.length; i++){
    masked1code[i] = masked1.charCodeAt(i);
  }


  // masked2
  var masked2 = new Uint32Array(1+((msg.length+3)>>2));
  var m8 = new Uint8Array(masked2.buffer, 0, (4 + msg.length));
  m8.set(mask,0);
  m8.set(msg,4);
  var m = masked2[0];
  for (var i=1;i<masked2.length;i++) {
    masked2[i]^=m;
  }
  console.log("----------------------lp(" + lp + ")--------------------");
  console.log(mask);
  console.log(masked1code);
  console.log(masked2);
  console.log(m8);
}

result:

>----------------------lp(0)--------------------
[ 244, 247, 131, 224 ]
[ 244, 247, 131, 224, 197, 197, 176, 212, 193, 193, 180, 216, 205, 199 ]
new Uint32Array([3766745076, 3568354757, 3635724737, 3766732749])
new Uint8Array([244, 247, 131, 224, 197, 197, 176, 212, 193, 193, 180, 216, 205, 199])
----------------------lp(1)--------------------
[ 203, 75, 141, 225 ]
[ 203, 75, 141, 225, 250, 121, 190, 213, 254, 125, 186, 217, 242, 123 ]
new Uint32Array([3784133579, 3586030074, 3652877822, 3784145906])
new Uint8Array([203, 75, 141, 225, 250, 121, 190, 213, 254, 125, 186, 217, 242, 123])
----------------------lp(2)--------------------
[ 172, 35, 218, 166 ]
[ 172, 35, 218, 166, 157, 17, 233, 146, 153, 21, 237, 158, 149, 19 ]
new Uint32Array([2799313836, 2464747933, 2666337689, 2799309717])
new Uint8Array([172, 35, 218, 166, 157, 17, 233, 146, 153, 21, 237, 158, 149, 19])
----------------------lp(3)--------------------
[ 231, 205, 151, 99 ]
[ 231, 205, 151, 99, 214, 255, 164, 87, 210, 251, 160, 91, 222, 253 ]
new Uint32Array([1670893031, 1470431190, 1537276882, 1670905310])
new Uint8Array([231, 205, 151, 99, 214, 255, 164, 87, 210, 251, 160, 91, 222, 253])
----------------------lp(4)--------------------
[ 121, 220, 55, 245 ]
[ 121, 220, 55, 245, 72, 238, 4, 193, 76, 234, 0, 205, 64, 236 ]
new Uint32Array([4114078841, 3238325832, 3439389260, 4114082880])
new Uint8Array([121, 220, 55, 245, 72, 238, 4, 193, 76, 234, 0, 205, 64, 236])
----------------------lp(5)--------------------
[ 165, 47, 134, 99 ]
[ 165, 47, 134, 99, 148, 29, 181, 87, 144, 25, 177, 91, 156, 31 ]
new Uint32Array([1669738405, 1471487380, 1538333072, 1669734300])
new Uint8Array([165, 47, 134, 99, 148, 29, 181, 87, 144, 25, 177, 91, 156, 31])
----------------------lp(6)--------------------
[ 9, 142, 128, 143 ]
[ 9, 142, 128, 143, 56, 188, 179, 187, 60, 184, 183, 183, 48, 190 ]
new Uint32Array([2407566857, 3149118520, 3082270780, 2407579184])
new Uint8Array([9, 142, 128, 143, 56, 188, 179, 187, 60, 184, 183, 183, 48, 190])
----------------------lp(7)--------------------
[ 217, 225, 170, 12 ]
[ 217, 225, 170, 12, 232, 211, 153, 56, 236, 215, 157, 52, 224, 209 ]
new Uint32Array([212525529, 949605352, 882759660, 212521440])
new Uint8Array([217, 225, 170, 12, 232, 211, 153, 56, 236, 215, 157, 52, 224, 209])
=undefined

It seems that your codes works well.