bench.js

var EventEmitter = require('events').EventEmitter;
var util = require('util');

function Ctx() {
  EventEmitter.call(this);
  this.i = 0;
}
util.inherits(Ctx, EventEmitter);

Ctx.prototype.blah = function() {
//  this.i++;
};

var count = 120000000;

start = (new Date).getTime();

for(i=0; i<count; i++) {
  var c = new Ctx();
  c.blah();
}

end = (new Date).getTime();

console.log(count / (end - start));

branch.lua

local Emitter = require('core').Emitter
local count = 1200000000

local o = Emitter:extend()
function o:initialize()
  self.i = 0
end

function o:blah()
--  self.i = self.i + 1
end

local start = os.clock()

for i=1, count do
  local ctx = o:new()
  ctx:blah()
end

local e = os.clock()

p(count / (e - start))