javascript - Socket.IO Performance Oddities -

i've been running few tests figure out fastest way send specific data using latest socket.io version (v1.4.5).

i tried passing object, string, uint8array , buffer. i'm excluding time generate formatted data.

    var d = date.now();      var obj = {"q":"-dgn,pqusy","u":{"gm5sp":[1109,1001],"t9sck":[2026],"hpcm8":[1407,841],"dnb7s":[1285,478],"pv7dt":[2043,986,31]}};     var objstr = json.stringify(obj);     var objuint8 = new uint8array(objstr.length);     for(var = 0 ; < objstr.length; i++)         objuint8[i] = objstr[i].charcodeat(i);     var objbuffer = new buffer(objuint8);             for(var = 0 ; < 20000; i++){         if(num === 0)             socket.emit('a',obj);                        if(num === 1)             socket.emit('a',objstr);                         if(num === 2)             socket.emit('a',objuint8);                       if(num === 3)             socket.emit('a',objbuffer);                  }      console.log(date.now() - d); 

results:

object: 244ms
string: 126ms
uint8array: 1292ms
buffer: 212ms

why uint8array slow? isn't similar nodejs buffer? shouldn't buffer faster string?