From 39058bef0733e6fae3cf160d71935127eab97bdd Mon Sep 17 00:00:00 2001
From: wicked <wicked@alawar.com>
Date: Thu, 25 Oct 2012 11:53:35 +0700
Subject: [PATCH] setTimeout: do not calculate Timeout._when property

Dramatically improves Timer performance.
---
 lib/timers.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/timers.js b/lib/timers.js
index 3900d61c94..8431b2ddd9 100644
--- a/lib/timers.js
+++ b/lib/timers.js
@@ -263,12 +263,15 @@ var Timeout = function(after) {
   this._idleTimeout = after;
   this._idlePrev = this;
   this._idleNext = this;
-  this._when = Date.now() + after;
+  this._idleStart = null;
+  this._onTimeout = null;
 };
 
 Timeout.prototype.unref = function() {
   if (!this._handle) {
-    var delay = this._when - Date.now();
+    var now = Date.now();
+    if (!this._idleStart) this._idleStart = now;
+    var delay = this._idleStart + this._idleTimeout - now;
     if (delay < 0) delay = 0;
     exports.unenroll(this);
     this._handle = new Timer();