object-lookup.js

function benchmark( times, fn ) {
  var start = performance.now()
  
  for( var i = 0; i < times; i++ ) {
    fn();
  }
  
  return ( performance.now() - start ) / times;
}

var plainObject = {
  TEST: 'TEST',
  TEST2: 'TEST2',
}
var withProto = Object.create( null );
withProto.TEST = 'TEST';
withProto.TEST2 = 'TEST2';

var x, y, a, b;

// Ignore these results to ensure a warm start later
benchmark( 10000000, function() {
  b = plainObject.TEST;
} );
benchmark( 10000000, function() {
  a = withProto.TEST;
} );


var plainObjectTime = benchmark( 1000000000, function() {
  y = plainObject.TEST;
} );
var withProtoTime = benchmark( 1000000000, function() {
  x = withProto.TEST;
} );

console.log( 'plain object', plainObjectTime, 'ms' );
console.log( 'with prototype ', withProtoTime, 'ms' );