diff --git a/Debug/StopwatchEvent.php b/Debug/StopwatchEvent.php
index 200c465bac..82c463906f 100644
--- a/Debug/StopwatchEvent.php
+++ b/Debug/StopwatchEvent.php
@@ -82,7 +82,7 @@ public function stop()
             throw new \LogicException('stop() called but start() has not been called before.');
         }
 
-        $this->periods[] = array(array_pop($this->started), $this->getNow());
+        $this->periods[] = new StopwatchPeriod(array_pop($this->started), $this->getNow());
 
         return $this;
     }
@@ -110,7 +110,7 @@ public function ensureStopped()
     /**
      * Gets all event periods.
      *
-     * @return array An array of periods
+     * @return StopwatchPeriod[] An array of StopwatchPeriod instances
      */
     public function getPeriods()
     {
@@ -124,7 +124,7 @@ public function getPeriods()
      */
     public function getStartTime()
     {
-        return isset($this->periods[0]) ? $this->periods[0][0] : 0;
+        return isset($this->periods[0]) ? $this->periods[0]->getStartTime() : 0;
     }
 
     /**
@@ -134,7 +134,7 @@ public function getStartTime()
      */
     public function getEndTime()
     {
-        return ($count = count($this->periods)) ? $this->periods[$count - 1][1] : 0;
+        return ($count = count($this->periods)) ? $this->periods[$count - 1]->getEndTime() : 0;
     }
 
     /**
@@ -146,12 +146,29 @@ public function getTotalTime()
     {
         $total = 0;
         foreach ($this->periods as $period) {
-            $total += $period[1] - $period[0];
+            $total += $period->getTime();
         }
 
         return $this->formatTime($total);
     }
 
+    /**
+     * Gets the max memory usage of all periods.
+     *
+     * @return integer The memory usage (in bytes)
+     */
+    public function getMemory()
+    {
+        $memory = 0;
+        foreach ($this->periods as $period) {
+            if ($period->getMemory() > $memory) {
+                $memory = $period->getMemory();
+            }
+        }
+
+        return $memory;
+    }
+
     /**
      * Return the current time relative to origin.
      *
diff --git a/Debug/StopwatchPeriod.php b/Debug/StopwatchPeriod.php
new file mode 100644
index 0000000000..f920e8dedb
--- /dev/null
+++ b/Debug/StopwatchPeriod.php
@@ -0,0 +1,77 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Debug;
+
+/**
+ * Represents an Period for an Event.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class StopwatchPeriod
+{
+    private $start;
+    private $end;
+    private $memory;
+
+    /**
+     * Constructor
+     *
+     * @param integer $start The relative time of the start of the period
+     * @param integer $end   The relative time of the end of the period
+     */
+    public function __construct($start, $end)
+    {
+        $this->start = $start;
+        $this->end = $end;
+        $this->memory = memory_get_usage();
+    }
+
+    /**
+     * Gets the relative time of the start of the period.
+     *
+     * @return integer The time (in milliseconds)
+     */
+    public function getStartTime()
+    {
+        return $this->start;
+    }
+
+    /**
+     * Gets the relative time of the end of the period.
+     *
+     * @return integer The time (in milliseconds)
+     */
+    public function getEndTime()
+    {
+        return $this->end;
+    }
+
+    /**
+     * Gets the time spent in this period.
+     *
+     * @return integer The time (in milliseconds)
+     */
+    public function getTime()
+    {
+        return $this->end - $this->start;
+    }
+
+    /**
+     * Gets the memory usage.
+     *
+     * @return integer The memory usage (in bytes)
+     */
+    public function getMemory()
+    {
+        return $this->memory;
+    }
+}