diff --git a/trunk/CHANGELOG.txt b/trunk/CHANGELOG.txt
index 9e8a6db16..18579ed97 100644
--- a/trunk/CHANGELOG.txt
+++ b/trunk/CHANGELOG.txt
@@ -3,6 +3,7 @@ Process Hacker
 1.3.5.5
  * NEW:
    * Modules tab shows mapped files
+   * "Reduce Working Set" function
  * FIXED:
 
 1.3.5.0
diff --git a/trunk/ProcessHacker/Forms/HackerWindow.Designer.cs b/trunk/ProcessHacker/Forms/HackerWindow.Designer.cs
index d6382f25f..2f32cb19f 100644
--- a/trunk/ProcessHacker/Forms/HackerWindow.Designer.cs
+++ b/trunk/ProcessHacker/Forms/HackerWindow.Designer.cs
@@ -37,6 +37,7 @@
             this.suspendMenuItem = new System.Windows.Forms.MenuItem();
             this.resumeMenuItem = new System.Windows.Forms.MenuItem();
             this.restartProcessMenuItem = new System.Windows.Forms.MenuItem();
+            this.reduceWorkingSetProcessMenuItem = new System.Windows.Forms.MenuItem();
             this.menuItem5 = new System.Windows.Forms.MenuItem();
             this.affinityProcessMenuItem = new System.Windows.Forms.MenuItem();
             this.setTokenProcessMenuItem = new System.Windows.Forms.MenuItem();
@@ -168,6 +169,7 @@
             this.suspendMenuItem,
             this.resumeMenuItem,
             this.restartProcessMenuItem,
+            this.reduceWorkingSetProcessMenuItem,
             this.menuItem5,
             this.affinityProcessMenuItem,
             this.setTokenProcessMenuItem,
@@ -210,33 +212,39 @@
             this.restartProcessMenuItem.Text = "Restart";
             this.restartProcessMenuItem.Click += new System.EventHandler(this.restartProcessMenuItem_Click);
             // 
+            // reduceWorkingSetProcessMenuItem
+            // 
+            this.reduceWorkingSetProcessMenuItem.Index = 4;
+            this.reduceWorkingSetProcessMenuItem.Text = "Reduce Working Set";
+            this.reduceWorkingSetProcessMenuItem.Click += new System.EventHandler(this.reduceWorkingSetProcessMenuItem_Click);
+            // 
             // menuItem5
             // 
-            this.menuItem5.Index = 4;
+            this.menuItem5.Index = 5;
             this.menuItem5.Text = "-";
             // 
             // affinityProcessMenuItem
             // 
-            this.affinityProcessMenuItem.Index = 5;
+            this.affinityProcessMenuItem.Index = 6;
             this.affinityProcessMenuItem.Text = "Affinity...";
             this.affinityProcessMenuItem.Click += new System.EventHandler(this.affinityProcessMenuItem_Click);
             // 
             // setTokenProcessMenuItem
             // 
-            this.setTokenProcessMenuItem.Index = 6;
+            this.setTokenProcessMenuItem.Index = 7;
             this.setTokenProcessMenuItem.Text = "Set Token...";
             this.setTokenProcessMenuItem.Click += new System.EventHandler(this.setTokenProcessMenuItem_Click);
             // 
             // terminatorProcessMenuItem
             // 
-            this.terminatorProcessMenuItem.Index = 7;
+            this.terminatorProcessMenuItem.Index = 8;
             this.terminatorProcessMenuItem.Text = "Terminator...";
             this.terminatorProcessMenuItem.Click += new System.EventHandler(this.terminatorProcessMenuItem_Click);
             // 
             // priorityMenuItem
             // 
             this.vistaMenu.SetImage(this.priorityMenuItem, global::ProcessHacker.Properties.Resources.control_equalizer_blue);
-            this.priorityMenuItem.Index = 8;
+            this.priorityMenuItem.Index = 9;
             this.priorityMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
             this.realTimeMenuItem,
             this.highMenuItem,
@@ -290,7 +298,7 @@
             // 
             // runAsProcessMenuItem
             // 
-            this.runAsProcessMenuItem.Index = 9;
+            this.runAsProcessMenuItem.Index = 10;
             this.runAsProcessMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
             this.launchAsUserProcessMenuItem,
             this.launchAsThisUserProcessMenuItem});
@@ -312,36 +320,36 @@
             // 
             this.propertiesProcessMenuItem.DefaultItem = true;
             this.vistaMenu.SetImage(this.propertiesProcessMenuItem, global::ProcessHacker.Properties.Resources.application_form_magnify);
-            this.propertiesProcessMenuItem.Index = 10;
+            this.propertiesProcessMenuItem.Index = 11;
             this.propertiesProcessMenuItem.Text = "&Properties...";
             this.propertiesProcessMenuItem.Click += new System.EventHandler(this.inspectProcessMenuItem_Click);
             // 
             // menuItem7
             // 
-            this.menuItem7.Index = 11;
+            this.menuItem7.Index = 12;
             this.menuItem7.Text = "-";
             // 
             // searchProcessMenuItem
             // 
-            this.searchProcessMenuItem.Index = 12;
+            this.searchProcessMenuItem.Index = 13;
             this.searchProcessMenuItem.Text = "&Search Online...";
             this.searchProcessMenuItem.Click += new System.EventHandler(this.searchProcessMenuItem_Click);
             // 
             // reanalyzeProcessMenuItem
             // 
-            this.reanalyzeProcessMenuItem.Index = 13;
+            this.reanalyzeProcessMenuItem.Index = 14;
             this.reanalyzeProcessMenuItem.Text = "Re-analyze";
             this.reanalyzeProcessMenuItem.Click += new System.EventHandler(this.reanalyzeProcessMenuItem_Click);
             // 
             // copyProcessMenuItem
             // 
             this.vistaMenu.SetImage(this.copyProcessMenuItem, global::ProcessHacker.Properties.Resources.page_copy);
-            this.copyProcessMenuItem.Index = 14;
+            this.copyProcessMenuItem.Index = 15;
             this.copyProcessMenuItem.Text = "&Copy";
             // 
             // selectAllProcessMenuItem
             // 
-            this.selectAllProcessMenuItem.Index = 15;
+            this.selectAllProcessMenuItem.Index = 16;
             this.selectAllProcessMenuItem.Text = "Select &All";
             this.selectAllProcessMenuItem.Click += new System.EventHandler(this.selectAllProcessMenuItem_Click);
             // 
@@ -1077,6 +1085,7 @@
         private System.Windows.Forms.MenuItem freeMemoryMenuItem;
         private System.Windows.Forms.MenuItem menuItem1;
         private System.Windows.Forms.MenuItem reanalyzeProcessMenuItem;
+        private System.Windows.Forms.MenuItem reduceWorkingSetProcessMenuItem;
     }
 }
 
diff --git a/trunk/ProcessHacker/Forms/HackerWindow.cs b/trunk/ProcessHacker/Forms/HackerWindow.cs
index 0fd0e0ad2..057cb3319 100644
--- a/trunk/ProcessHacker/Forms/HackerWindow.cs
+++ b/trunk/ProcessHacker/Forms/HackerWindow.cs
@@ -915,6 +915,20 @@ namespace ProcessHacker
             }
         }
 
+        private void reduceWorkingSetProcessMenuItem_Click(object sender, EventArgs e)
+        {
+            try
+            {
+                using (var phandle = new Win32.ProcessHandle(processSelectedPID,
+                    Win32.PROCESS_RIGHTS.PROCESS_ALL_ACCESS))
+                    phandle.EmptyWorkingSet();
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.Message, "Process Hacker", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
         private void inspectProcessMenuItem_Click(object sender, EventArgs e)
         {
             // user hasn't got any processes selected
diff --git a/trunk/ProcessHacker/Win32/API/Functions.cs b/trunk/ProcessHacker/Win32/API/Functions.cs
index 0a21b4e82..cda43385b 100644
--- a/trunk/ProcessHacker/Win32/API/Functions.cs
+++ b/trunk/ProcessHacker/Win32/API/Functions.cs
@@ -302,6 +302,9 @@ namespace ProcessHacker
 
         #region Processes
 
+        [DllImport("psapi.dll", SetLastError = true)]
+        public static extern bool EmptyWorkingSet(int ProcessHandle);
+
         [DllImport("psapi.dll", SetLastError = true, CharSet = CharSet.Unicode)]
         public static extern int GetMappedFileName(
             int ProcessHandle,
diff --git a/trunk/ProcessHacker/Win32/Handles/ProcessHandle.cs b/trunk/ProcessHacker/Win32/Handles/ProcessHandle.cs
index 0f0fd272f..bfd955f12 100644
--- a/trunk/ProcessHacker/Win32/Handles/ProcessHandle.cs
+++ b/trunk/ProcessHacker/Win32/Handles/ProcessHandle.cs
@@ -218,6 +218,16 @@ namespace ProcessHacker
                 return new ThreadHandle(this.CreateThread(startAddress, parameter));
             }
 
+            /// <summary>
+            /// Removes as many pages as possible from the process' working set. This requires the 
+            /// PROCESS_QUERY_INFORMATION and PROCESS_SET_INFORMATION permissions.
+            /// </summary>
+            public void EmptyWorkingSet()
+            {
+                if (!Win32.EmptyWorkingSet(this))
+                    ThrowLastWin32Error();
+            }
+
             /// <summary>
             /// Frees a memory region in the process' virtual memory.
             /// </summary>