added a bunch of speed tests using jslitmus

test/speed.js

@@ -0,0 +1,34 @@
+(function() {
+  
+  var numbers = [];
+  for (var i=0; i<1000; i++) numbers.push(i);
+  var objects = _.map(numbers, function(n){ return {num : n}; });
+  var randomized = _.sortBy(numbers, function(){ return Math.random(); });
+  
+  JSLitmus.test('_.each()', function() {
+    var timesTwo = [];
+    _.each(numbers, function(num){ timesTwo.push(num * 2); });
+    return timesTwo;
+  });
+  
+  JSLitmus.test('_.map()', function() {
+    return _.map(objects, function(obj){ return obj.num; });
+  });
+  
+  JSLitmus.test('_.pluck()', function() {
+    return _.pluck(objects, 'num');
+  });
+  
+  JSLitmus.test('_.uniq()', function() {
+    return _.uniq(randomized);
+  });
+  
+  JSLitmus.test('_.uniq() (sorted)', function() {
+    return _.uniq(numbers, true);
+  });
+  
+  JSLitmus.test('_.isEqual()', function() {
+    return _.isEqual(numbers, randomized);
+  });
+
+})();