time-require.patch

diff --git a/lib/module.js b/lib/module.js
index 6130394..80559f4 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -25,6 +25,7 @@ var runInThisContext = Script.runInThisContext;
 var runInNewContext = Script.runInNewContext;
 var assert = require('assert').ok;
 
+var timeRequire = +process.env.NODE_TIME_REQUIRE;
 
 // If obj.hasOwnProperty has been overridden, then calling
 // obj.hasOwnProperty(prop) will break.
@@ -359,7 +360,15 @@ Module.prototype.load = function(filename) {
 
 
 Module.prototype.require = function(path) {
-  return Module._load(path, this);
+  if (timeRequire) {
+    var start = process.hrtime();
+  }
+  var ret = Module._load(path, this);
+  if (timeRequire) {
+    var end = process.hrtime(start);
+    console.error(this.filename, path, end);
+  }
+  return ret;
 };
 
 

Or monkey-patch:

var Module = require('module');
Module.prototype.require = function(path) {
  var start = process.hrtime();
  var ret = Module._load(path, this);
  var end = process.hrtime(start);
  console.error(this.filename, path, end);
  return ret;
};

but of course that'll only print stats for modules that have not been loaded yet.

would be pretty cool if you could enable this or similar with NODE_DEBUG

@visionmedia Agreed. My only hesitation in landing a patch like this is that people get all excited and want to put a bunch of bullshit into the module system, and it's easier to say no if I also deny my own feature requests. But maybe something like NODE_DEBUG=module and match the pattern that we have in most of the other internal modules, that'd be nice.