动态内存分配导致影响Javascript性能的问题

function Context() {
}
Context.prototype.drawImage3 = function(image, x, y) {
  this.drawImage9(image, 0, 0, image.width, image.height, x, y, image.width, image.height);
}
Context.prototype.drawImage5 = function(image, dx, dy, dw, dh) {
  this.drawImage9(image, 0, 0, image.width, image.height, dx, dy, dw, dh);
}
Context.prototype.drawImage9 = function(image, sx, sy, sw, sh, dx, dy, dw, dh) {
  //DO IT
}
Context.prototype.drawImage = function(image, a, b, c, d, e, f, g, h) {
  var n = arguments.length;
  if(n === 3) {
    this.drawImage3(image, a, b);
  }else if(n === 5) {
    this.drawImage5(image, a, b, c, d);
  }else if(n === 9) {
    this.drawImage9(image, a, b, c, d, e, f, g, h);
  }
}

var image = {width:100, height:200};
var ctx = new Context();
function test() {
  var a = Math.random() * 100;
  var b = Math.random() * 100;
  var c = Math.random() * 100;
  var d = Math.random() * 100;
  var e = Math.random() * 100;
  var f = Math.random() * 100;
  var g = Math.random() * 100;
  var h = Math.random() * 100;
  for(var i = 0; i < 1000; i++) {
    ctx.drawImage(image, a, b);
    ctx.drawImage(image, a, b, c, d);
    ctx.drawImage(image, a, b, c, d, e, f, g, h);
  }
}
window.onload = function() {
  function loop() {
    test();
    requestAnimationFrame(loop);
  }
  requestAnimationFrame(loop);
}

void Heap::OnAllocationEvent(HeapObject* object, int size_in_bytes) {
 HeapProfiler* profiler = isolate_->heap_profiler();
 if (profiler->is_tracking_allocations()) {
  profiler->AllocationEvent(object->address(), size_in_bytes);
 }
 if (FLAG_verify_predictable) {
  ++allocations_count_;
  // Advance synthetic time by making a time request.
  MonotonicallyIncreasingTimeInMs();
  UpdateAllocationsHash(object);
  UpdateAllocationsHash(size_in_bytes);
  if (allocations_count_ % FLAG_dump_allocations_digest_at_alloc == 0) {
   PrintAlloctionsHash();
  }
 }
 if (FLAG_trace_allocation_stack_interval > 0) {
  if (!FLAG_verify_predictable) ++allocations_count_;
  if (allocations_count_ % FLAG_trace_allocation_stack_interval == 0) {
   isolate()->PrintStack(stdout, Isolate::kPrintStackConcise);
  }
 }
}

Context.prototype.drawImage = function() {
  var n = arguments.length;
  if(n === 3) {
    this.drawImage3.apply(this, arguments);
  }else if(n === 5) {
    this.drawImage5.apply(this, arguments);
  }else if(n === 9) {
    this.drawImage9.apply(this, arguments);
  }
}