three.js/test/benchmark/core/Float32Array.js

var input = new Float32Array( 10000 * 3 );
var output = new Float32Array( 10000 * 3 );

for( var j = 0, jl = input.length; j < jl; j ++ ) {
	input[j] = j;
}

var inputVectors = [];
var outputVectors = [];

for( var j = 0, jl = input.length/3; j < jl; j ++ ) {
	inputVectors.push( new THREE.Vector3( j*3, j*3+1, j*3+2 ) );
	outputVectors.push( new THREE.Vector3() );
}

var suite = new Benchmark.Suite;

suite.add('Float32Array-Float32Array', function() {
	var value3 = new Float32Array( 3 );
	for (var i = 0, il = input.length / 3; i < il; i += 3) {
	  value3[0] = input[i + 0];
	  value3[1] = input[i + 1];
	  value3[2] = input[i + 2];
	  value3[0] *= 1.01;
	  value3[1] *= 1.03;
	  value3[2] *= 0.98;
	  output[i + 0] = value3[0];
	  output[i + 1] = value3[1];
	  output[i + 2] = value3[2];
	}
});

suite.add('Float32Array-Array', function() {
	var value2 = [0,0,0];
	for (var i = 0, il = input.length / 3; i < il; i += 3) {
	  value2[0] = input[i + 0];
	  value2[1] = input[i + 1];
	  value2[2] = input[i + 2];
	  value2[0] *= 1.01;
	  value2[1] *= 1.03;
	  value2[2] *= 0.98;
	  output[i + 0] = value2[0];
	  output[i + 1] = value2[1];
	  output[i + 2] = value2[2];
	}
});

suite.add('Float32Array-Literal', function() {
	var x, y, z;
	for (var i = 0, il = input.length / 3; i < il; i += 3) {
	  x = input[i + 0];
	  y = input[i + 1];
	  z = input[i + 2];
	  x *= 1.01;
	  y *= 1.03;
	  z *= 0.98;
	  output[i + 0] = x;
	  output[i + 1] = y;
	  output[i + 2] = z;
	}
});

suite.add('Float32Array-Vector3', function() {
	var value = new THREE.Vector3();
	for (var i = 0, il = input.length / 3; i < il; i += 3) {
	  value.x = input[i + 0];
	  value.y = input[i + 1];
	  value.z = input[i + 2];
	  value.x *= 1.01;
	  value.y *= 1.03;
	  value.z *= 0.98;
	  output[i + 0] = value.x;
	  output[i + 1] = value.y;
	  output[i + 2] = value.z;
	}
});

suite.add('Vector3Array-Direct', function() {
	for (var i = 0, il = inputVectors.length; i < il; i ++ ) {
		outputVectors[i].copy( inputVectors[i] );
		outputVectors[i].x *= 1.01;
		outputVectors[i].y *= 1.03;
		outputVectors[i].z *= 0.98;
	}
});

suite.add('Vector3Array-Vector3', function() {
	var value = new THREE.Vector3();
	for (var i = 0, il = inputVectors.length; i < il; i ++ ) {
	  value.copy( inputVectors[i] );
	  value.x *= 1.01;
	  value.y *= 1.03;
	  value.z *= 0.98;
	  outputVectors[i].copy( value );
	}
});

suite.on('cycle', function(event, bench) {
  console.log(String(event.target));
});

suite.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
  console.log( "Done" );
});

suite.run(true);