This issue was originally filed by c.brian.stu...@gmail.com

What steps will reproduce the problem?
1.Run the programs below and use "top" or other tool to monitor memory usage.

What is the expected output? What do you see instead?
Node.js uses about 135Megs (RES)
Dart uses about 240 Megs
Dart2js version running in nodejs uses about 460 Megs!!!

Dart clearly needs to give some thought to memory usage.

What version of the product are you using? On what operating system?
Dart VM version: 1.2.0 (Tue Feb 25 07:34:09 2014) on "linux_x64"
Running on Linux Mint.

Please provide any additional information below.
-- Program 1, run in dart --
import 'dart:io';
import 'dart:convert';

main() {
var rec = { "_id" : { "_oid" : "4d2295fb908e49485b000001" }, "shipping_email_address" : "", "pays_fc_sales_tax" : false, "po_payment_type" : "Check", "tc_email_address" : "", "billing_email_address" : "", "pays_larimer_sales_tax" : false, "pays_co_sales_tax" : false, "order_type" : "Check", "is_bill_same_as_ship" : true, "is_drop_shipment" : false, "tc_name" : "Mrs. Butterworth", "has_cash_discount" : false, "_obj" : "Order", "email_note" : "", "customer_name" : "Name Removed", "amount_paid" : { "_v" : 13495, "_obj" : "Money" }, "payment_ref_num" : "", "billing_address" : "", "registration_name" : "Name Removed", "po_payment_date" : null, "pc_name" : "", "po_payment" : { "_v" : 0, "_obj" : "Money" }, "order_date" : { "_date" : 775958400000 }, "amount_forgiven" : { "_v" : 0, "_obj" : "Money" }, "pc_phone_number" : "", "internal_note" : "(617) 252-0052 - U.S. unit ordering for a UK unit.", "items" : [ { "product" : "ATRLS", "price" : { "_v" : 4000, "_obj" : "Money" }, "is_taxable" : true, "discount" : 0, "_obj" : "OrderItem", "quantity" : 3 }, { "product" : "ATRLS_MEDIA", "price" : { "_v" : 495, "_obj" : "Money" }, "is_taxable" : true, "discount" : 0, "_obj" : "OrderItem", "quantity" : 1 }, { "product" : "WTFEE", "price" : { "_v" : 1000, "_obj" : "Money" }, "is_taxable" : false, "discount" : 0, "_obj" : "OrderItem", "quantity" : 1 } ], "pc_email_address" : "", "customer_order_ref_num" : "010010", "shipping_address" : "Name Removed\nAddress Obscured\nCambridge, MA 02142\n", "country" : "USA", "order_number" : 172 };

var i;
var l = [];
for (i=0; i<20000; i++) {
  l.add(JSON.decode(JSON.encode(rec)));
}
print('Hit return to exit');
stdin.readLineSync();
}
-- Program 2, run in node.js --
var sleep = require('sleep');

rec = { "_id" : { "$oid" : "4d2295fb908e49485b000001" }, "shipping_email_address" : "", "pays_fc_sales_tax" : false, "po_payment_type" : "Check", "tc_email_address" : "", "billing_email_address" : "", "pays_larimer_sales_tax" : false, "pays_co_sales_tax" : false, "order_type" : "Check", "is_bill_same_as_ship" : true, "is_drop_shipment" : false, "tc_name" : "Mrs. Butterworth", "has_cash_discount" : false, "_obj" : "Order", "email_note" : "", "customer_name" : "Name Removed", "amount_paid" : { "_v" : 13495, "_obj" : "Money" }, "payment_ref_num" : "", "billing_address" : "", "registration_name" : "Name Removed", "po_payment_date" : null, "pc_name" : "", "po_payment" : { "_v" : 0, "_obj" : "Money" }, "order_date" : { "$date" : 775958400000 }, "amount_forgiven" : { "_v" : 0, "_obj" : "Money" }, "pc_phone_number" : "", "internal_note" : "(617) 252-0052 - U.S. unit ordering for a UK unit.", "items" : [ { "product" : "ATRLS", "price" : { "_v" : 4000, "_obj" : "Money" }, "is_taxable" : true, "discount" : 0, "_obj" : "OrderItem", "quantity" : 3 }, { "product" : "ATRLS_MEDIA", "price" : { "_v" : 495, "_obj" : "Money" }, "is_taxable" : true, "discount" : 0, "_obj" : "OrderItem", "quantity" : 1 }, { "product" : "WTFEE", "price" : { "_v" : 1000, "_obj" : "Money" }, "is_taxable" : false, "discount" : 0, "_obj" : "OrderItem", "quantity" : 1 } ], "pc_email_address" : "", "customer_order_ref_num" : "010010", "shipping_address" : "Name Removed\nAddress Obscured\nCambridge, MA 02142\n", "country" : "USA", "order_number" : 172 }

var i;
var l = [];
for (i=0; i<20000; i++) {
  l.push(JSON.parse(JSON.stringify(rec)));
}
//console.log(rec);
sleep.sleep(600);
-- Program 3 --
// Run this Dart script through dart2js, edit out.js, add at top:
// var sleep = require('sleep');
// At the end add:
// sleep.sleep(600);
// Do a npm install sleep and run resulting out.js via nodejs
main() {
var rec = { "_id" : { "_oid" : "4d2295fb908e49485b000001" }, "shipping_email_address" : "", "pays_fc_sales_tax" : false, "po_payment_type" : "Check", "tc_email_address" : "", "billing_email_address" : "", "pays_larimer_sales_tax" : false, "pays_co_sales_tax" : false, "order_type" : "Check", "is_bill_same_as_ship" : true, "is_drop_shipment" : false, "tc_name" : "Mrs. Butterworth", "has_cash_discount" : false, "_obj" : "Order", "email_note" : "", "customer_name" : "Name Removed", "amount_paid" : { "_v" : 13495, "_obj" : "Money" }, "payment_ref_num" : "", "billing_address" : "", "registration_name" : "Name Removed", "po_payment_date" : null, "pc_name" : "", "po_payment" : { "_v" : 0, "_obj" : "Money" }, "order_date" : { "_date" : 775958400000 }, "amount_forgiven" : { "_v" : 0, "_obj" : "Money" }, "pc_phone_number" : "", "internal_note" : "(617) 252-0052 - U.S. unit ordering for a UK unit.", "items" : [ { "product" : "ATRLS", "price" : { "_v" : 4000, "_obj" : "Money" }, "is_taxable" : true, "discount" : 0, "_obj" : "OrderItem", "quantity" : 3 }, { "product" : "ATRLS_MEDIA", "price" : { "_v" : 495, "_obj" : "Money" }, "is_taxable" : true, "discount" : 0, "_obj" : "OrderItem", "quantity" : 1 }, { "product" : "WTFEE", "price" : { "_v" : 1000, "_obj" : "Money" }, "is_taxable" : false, "discount" : 0, "_obj" : "OrderItem", "quantity" : 1 } ], "pc_email_address" : "", "customer_order_ref_num" : "010010", "shipping_address" : "Name Removed\nAddress Obscured\nCambridge, MA 02142\n", "country" : "USA", "order_number" : 172 };

var i;
var l = [];
for (i=0; i<20000; i++) {
  l.add(JSON.decode(JSON.encode(rec)));
}