diff --git a/Implab.Diagnostics.Interactive/InteractiveListener.cs b/Implab.Diagnostics.Interactive/InteractiveListener.cs
--- a/Implab.Diagnostics.Interactive/InteractiveListener.cs
+++ b/Implab.Diagnostics.Interactive/InteractiveListener.cs
@@ -56,7 +56,7 @@ namespace Implab.Diagnostics.Interactive
                 if (m_queue.TryDequeue(out item)) {
                     Interlocked.Decrement(ref m_queueLength);
 
-                    m_syncGuiThread.Send(x => m_form.AddTraceEvent(item),null);
+                    m_syncGuiThread.Post(x => m_form.AddTraceEvent(item),null);
                 } else {
                     m_queueEvent.WaitOne();
                 }
@@ -113,7 +113,8 @@ namespace Implab.Diagnostics.Interactive
                 Message = entry.ToString(),
                 Thread = args.ThreadId,
                 Channel = args.Channel.ToString(),
-                Timestamp = Environment.TickCount
+                Timestamp = Environment.TickCount,
+                TimeDelta = args.OperationTimeOffset
             };
 
             Enqueue(item);
diff --git a/Implab.Diagnostics.Interactive/TraceForm.Designer.cs b/Implab.Diagnostics.Interactive/TraceForm.Designer.cs
--- a/Implab.Diagnostics.Interactive/TraceForm.Designer.cs
+++ b/Implab.Diagnostics.Interactive/TraceForm.Designer.cs
@@ -23,13 +23,14 @@
         /// the contents of this method with the code editor.
         /// </summary>
         private void InitializeComponent() {
-            this.components = new System.ComponentModel.Container();
             System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle1 = new System.Windows.Forms.DataGridViewCellStyle();
-            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle3 = new System.Windows.Forms.DataGridViewCellStyle();
+            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle4 = new System.Windows.Forms.DataGridViewCellStyle();
             System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 = new System.Windows.Forms.DataGridViewCellStyle();
+            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle3 = new System.Windows.Forms.DataGridViewCellStyle();
             this.eventsDataGrid = new System.Windows.Forms.DataGridView();
-            this.traceViewItemBindingSource = new System.Windows.Forms.BindingSource(this.components);
+            this.traceViewItemBindingSource = new System.Windows.Forms.BindingSource();
             this.threadDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
+            this.TimeDelta = new System.Windows.Forms.DataGridViewTextBoxColumn();
             this.Channel = new System.Windows.Forms.DataGridViewTextBoxColumn();
             this.messageDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
             ((System.ComponentModel.ISupportInitialize)(this.eventsDataGrid)).BeginInit();
@@ -56,20 +57,22 @@
             this.eventsDataGrid.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
             this.eventsDataGrid.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
             this.threadDataGridViewTextBoxColumn,
+            this.TimeDelta,
             this.Channel,
             this.messageDataGridViewTextBoxColumn});
             this.eventsDataGrid.DataSource = this.traceViewItemBindingSource;
-            dataGridViewCellStyle3.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
-            dataGridViewCellStyle3.BackColor = System.Drawing.SystemColors.Window;
-            dataGridViewCellStyle3.Font = new System.Drawing.Font("Lucida Console", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
-            dataGridViewCellStyle3.ForeColor = System.Drawing.SystemColors.ControlText;
-            dataGridViewCellStyle3.SelectionBackColor = System.Drawing.SystemColors.Highlight;
-            dataGridViewCellStyle3.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
-            dataGridViewCellStyle3.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
-            this.eventsDataGrid.DefaultCellStyle = dataGridViewCellStyle3;
+            dataGridViewCellStyle4.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
+            dataGridViewCellStyle4.BackColor = System.Drawing.SystemColors.Window;
+            dataGridViewCellStyle4.Font = new System.Drawing.Font("Lucida Console", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
+            dataGridViewCellStyle4.ForeColor = System.Drawing.SystemColors.ControlText;
+            dataGridViewCellStyle4.SelectionBackColor = System.Drawing.SystemColors.Highlight;
+            dataGridViewCellStyle4.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
+            dataGridViewCellStyle4.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
+            this.eventsDataGrid.DefaultCellStyle = dataGridViewCellStyle4;
             this.eventsDataGrid.Location = new System.Drawing.Point(12, 12);
             this.eventsDataGrid.Name = "eventsDataGrid";
             this.eventsDataGrid.ReadOnly = true;
+            this.eventsDataGrid.RowHeadersVisible = false;
             this.eventsDataGrid.RowHeadersWidth = 17;
             this.eventsDataGrid.RowTemplate.Resizable = System.Windows.Forms.DataGridViewTriState.False;
             this.eventsDataGrid.Size = new System.Drawing.Size(939, 480);
@@ -82,31 +85,43 @@
             // 
             // threadDataGridViewTextBoxColumn
             // 
-            this.threadDataGridViewTextBoxColumn.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.AllCellsExceptHeader;
+            this.threadDataGridViewTextBoxColumn.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.AllCells;
             this.threadDataGridViewTextBoxColumn.DataPropertyName = "Thread";
             this.threadDataGridViewTextBoxColumn.HeaderText = "TID";
             this.threadDataGridViewTextBoxColumn.Name = "threadDataGridViewTextBoxColumn";
             this.threadDataGridViewTextBoxColumn.ReadOnly = true;
-            this.threadDataGridViewTextBoxColumn.Width = 5;
+            this.threadDataGridViewTextBoxColumn.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.NotSortable;
+            this.threadDataGridViewTextBoxColumn.Width = 32;
+            // 
+            // TimeDelta
+            // 
+            this.TimeDelta.DataPropertyName = "TimeDelta";
+            dataGridViewCellStyle2.Format = "\'+\' 0 \'ms\'";
+            dataGridViewCellStyle2.NullValue = null;
+            this.TimeDelta.DefaultCellStyle = dataGridViewCellStyle2;
+            this.TimeDelta.HeaderText = "TimeDelta";
+            this.TimeDelta.Name = "TimeDelta";
+            this.TimeDelta.ReadOnly = true;
+            this.TimeDelta.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.NotSortable;
             // 
             // Channel
             // 
-            this.Channel.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.DisplayedCells;
             this.Channel.DataPropertyName = "Channel";
             this.Channel.HeaderText = "Channel";
             this.Channel.Name = "Channel";
             this.Channel.ReadOnly = true;
-            this.Channel.Width = 79;
+            this.Channel.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.NotSortable;
             // 
             // messageDataGridViewTextBoxColumn
             // 
             this.messageDataGridViewTextBoxColumn.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.Fill;
             this.messageDataGridViewTextBoxColumn.DataPropertyName = "FormattedMessage";
-            dataGridViewCellStyle2.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
-            this.messageDataGridViewTextBoxColumn.DefaultCellStyle = dataGridViewCellStyle2;
+            dataGridViewCellStyle3.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
+            this.messageDataGridViewTextBoxColumn.DefaultCellStyle = dataGridViewCellStyle3;
             this.messageDataGridViewTextBoxColumn.HeaderText = "Message";
             this.messageDataGridViewTextBoxColumn.Name = "messageDataGridViewTextBoxColumn";
             this.messageDataGridViewTextBoxColumn.ReadOnly = true;
+            this.messageDataGridViewTextBoxColumn.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.NotSortable;
             // 
             // TraceForm
             // 
@@ -127,8 +142,8 @@
         private System.Windows.Forms.DataGridView eventsDataGrid;
         private System.Windows.Forms.BindingSource traceViewItemBindingSource;
         private System.Windows.Forms.DataGridViewTextBoxColumn threadDataGridViewTextBoxColumn;
+        private System.Windows.Forms.DataGridViewTextBoxColumn TimeDelta;
         private System.Windows.Forms.DataGridViewTextBoxColumn Channel;
         private System.Windows.Forms.DataGridViewTextBoxColumn messageDataGridViewTextBoxColumn;
-
     }
 }
\ No newline at end of file
diff --git a/Implab.Diagnostics.Interactive/TraceForm.resx b/Implab.Diagnostics.Interactive/TraceForm.resx
--- a/Implab.Diagnostics.Interactive/TraceForm.resx
+++ b/Implab.Diagnostics.Interactive/TraceForm.resx
@@ -117,6 +117,9 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <metadata name="TimeDelta.UserAddedColumn" type="System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+    <value>True</value>
+  </metadata>
   <metadata name="Channel.UserAddedColumn" type="System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>True</value>
   </metadata>
diff --git a/Implab.Diagnostics.Interactive/TraceViewItem.cs b/Implab.Diagnostics.Interactive/TraceViewItem.cs
--- a/Implab.Diagnostics.Interactive/TraceViewItem.cs
+++ b/Implab.Diagnostics.Interactive/TraceViewItem.cs
@@ -9,6 +9,7 @@ namespace Implab.Diagnostics.Interactive
         string m_formattedValue;
 
         public string Message { get; set; }
+        public int TimeDelta { get; set; }
         public int Timestamp { get; set; }
         public int Indent { get; set; }
         public int Thread { get; set; }