diff --git a/core/ArchiveProcessor/PluginsArchiver.php b/core/ArchiveProcessor/PluginsArchiver.php
index c12a79a239e..74871287280 100644
--- a/core/ArchiveProcessor/PluginsArchiver.php
+++ b/core/ArchiveProcessor/PluginsArchiver.php
@@ -14,9 +14,9 @@
 use Piwik\DataAccess\ArchiveWriter;
 use Piwik\DataTable\Manager;
 use Piwik\Metrics;
-use Piwik\Piwik;
 use Piwik\Plugin\Archiver;
 use Piwik\Log;
+use Piwik\Timer;
 
 /**
  * This class creates the Archiver objects found in plugins and will trigger aggregation,
@@ -102,7 +102,7 @@ public function callAggregateAllPlugins($visits, $visitsConverted)
             }
 
             if ($this->shouldProcessReportsForPlugin($pluginName)) {
-                $memoryUsageBeforePluginArchiving = memory_get_usage(true);
+                $timer = new Timer();
                 if ($this->isSingleSiteDayArchive) {
                     Log::debug("PluginsArchiver::%s: Archiving day reports for plugin '%s'.", __FUNCTION__, $pluginName);
 
@@ -113,11 +113,10 @@ public function callAggregateAllPlugins($visits, $visitsConverted)
                     $archiver->aggregateMultipleReports();
                 }
 
-                $memoryUsageInArchiving = memory_get_usage(true) - $memoryUsageBeforePluginArchiving;
-                Log::debug("PluginsArchiver::%s: Used %s memory while archiving %s reports for plugin '%s'.",
+                Log::debug("PluginsArchiver::%s: %s while archiving %s reports for plugin '%s'.",
                     __FUNCTION__,
-                    Piwik::bytesToSize($memoryUsageInArchiving),
-                    $this->isSingleSiteDayArchive ? 'day' : 'period',
+                    $timer->getMemoryLeak(),
+                    $this->params->getPeriod()->getLabel(),
                     $pluginName
                 );
             } else {
diff --git a/core/Piwik.php b/core/Piwik.php
index 829ac1ec6c8..625a7cf9f8f 100644
--- a/core/Piwik.php
+++ b/core/Piwik.php
@@ -765,37 +765,4 @@ public static function doAsSuperUser($function)
 
         return $result;
     }
-
-    /**
-     * Convert bytes to human readable format
-     *
-     * @param int $bytes Size in bytes to convert
-     * @param int $precision Precision value, default 2.
-     * @return string
-     */
-    public static function bytesToSize($bytes, $precision = 2)
-    {
-        $kilobyte = 1024;
-        $megabyte = $kilobyte * 1024;
-        $gigabyte = $megabyte * 1024;
-        $terabyte = $gigabyte * 1024;
-
-        if (($bytes >= 0) && ($bytes < $kilobyte)) {
-            return $bytes . ' B';
-
-        } elseif (($bytes >= $kilobyte) && ($bytes < $megabyte)) {
-            return round($bytes / $kilobyte, $precision) . ' KB';
-
-        } elseif (($bytes >= $megabyte) && ($bytes < $gigabyte)) {
-            return round($bytes / $megabyte, $precision) . ' MB';
-
-        } elseif (($bytes >= $gigabyte) && ($bytes < $terabyte)) {
-            return round($bytes / $gigabyte, $precision) . ' GB';
-
-        } elseif ($bytes >= $terabyte) {
-            return round($bytes / $terabyte, $precision) . ' TB';
-        } else {
-            return $bytes . ' B';
-        }
-    }
 }