Add benchmark results compared to JSON to README?

encodedecode_json.js

var msg = { hello: 'world' }
var encode = JSON.stringify
var decode = JSON.parse
var max = 100000
var start
var stop
var i

function run () {
  for (i = 0; i < max; i++) {
    decode(encode(msg))
  }
}

// preheat
run()

start = Date.now()
run()
stop = Date.now()
console.log('time', stop - start)
console.log('decode/s', max / (stop - start) * 1000)

$ node encodedecode_json.js
time 79
decode/s 1265822.7848101268

compared to

$ node encodedecode.js 
time 1594
decode/s 62735.25721455458

Am I misunderstanding something?...

Start with the benchmark examples in encodedecode_json.js and encodedecode.js, then inspect the README to see whether benchmark results are documented there. Clarify whether the measured comparison is valid and what results or explanation should be added before updating the documentation.