diff --git a/src/utils/Transaction.js b/src/utils/Transaction.js
index 5029d213e4..ede94e0f2e 100644
--- a/src/utils/Transaction.js
+++ b/src/utils/Transaction.js
@@ -57,9 +57,6 @@ var invariant = require('invariant');
  *                    +-----------------------------------------+
  * </pre>
  *
- * Bonus:
- * - Reports timing metrics by method name and wrapper index.
- *
  * Use cases:
  * - Preserving the input selection ranges before/after reconciliation.
  *   Restoring selection even in the event of an unexpected error.
@@ -99,20 +96,6 @@ var Mixin = {
     } else {
       this.wrapperInitData.length = 0;
     }
-    if (!this.timingMetrics) {
-      this.timingMetrics = {};
-    }
-    this.timingMetrics.methodInvocationTime = 0;
-    if (!this.timingMetrics.wrapperInitTimes) {
-      this.timingMetrics.wrapperInitTimes = [];
-    } else {
-      this.timingMetrics.wrapperInitTimes.length = 0;
-    }
-    if (!this.timingMetrics.wrapperCloseTimes) {
-      this.timingMetrics.wrapperCloseTimes = [];
-    } else {
-      this.timingMetrics.wrapperCloseTimes.length = 0;
-    }
     this._isInTransaction = false;
   },
 
@@ -145,7 +128,6 @@ var Mixin = {
       'Transaction.perform(...): Cannot initialize a transaction when there ' +
       'is already an outstanding transaction.'
     );
-    var memberStart = Date.now();
     var errorThrown;
     var ret;
     try {
@@ -159,8 +141,6 @@ var Mixin = {
       ret = method.call(scope, a, b, c, d, e, f);
       errorThrown = false;
     } finally {
-      var memberEnd = Date.now();
-      this.methodInvocationTime += (memberEnd - memberStart);
       try {
         if (errorThrown) {
           // If `method` throws, prefer to show that stack trace over any thrown
@@ -183,9 +163,7 @@ var Mixin = {
 
   initializeAll: function(startIndex) {
     var transactionWrappers = this.transactionWrappers;
-    var wrapperInitTimes = this.timingMetrics.wrapperInitTimes;
     for (var i = startIndex; i < transactionWrappers.length; i++) {
-      var initStart = Date.now();
       var wrapper = transactionWrappers[i];
       try {
         // Catching errors makes debugging more difficult, so we start with the
@@ -197,10 +175,6 @@ var Mixin = {
           wrapper.initialize.call(this) :
           null;
       } finally {
-        var curInitTime = wrapperInitTimes[i];
-        var initEnd = Date.now();
-        wrapperInitTimes[i] = (curInitTime || 0) + (initEnd - initStart);
-
         if (this.wrapperInitData[i] === Transaction.OBSERVED_ERROR) {
           // The initializer for wrapper i threw an error; initialize the
           // remaining wrappers but silence any exceptions from them to ensure
@@ -226,10 +200,8 @@ var Mixin = {
       'Transaction.closeAll(): Cannot close transaction when none are open.'
     );
     var transactionWrappers = this.transactionWrappers;
-    var wrapperCloseTimes = this.timingMetrics.wrapperCloseTimes;
     for (var i = startIndex; i < transactionWrappers.length; i++) {
       var wrapper = transactionWrappers[i];
-      var closeStart = Date.now();
       var initData = this.wrapperInitData[i];
       var errorThrown;
       try {
@@ -243,10 +215,6 @@ var Mixin = {
         }
         errorThrown = false;
       } finally {
-        var closeEnd = Date.now();
-        var curCloseTime = wrapperCloseTimes[i];
-        wrapperCloseTimes[i] = (curCloseTime || 0) + (closeEnd - closeStart);
-
         if (errorThrown) {
           // The closer for wrapper i threw an error; close the remaining
           // wrappers but silence any exceptions from them to ensure that the