diff --git a/IOB-WIN-NEXT/AdapterForm.cs b/IOB-WIN-NEXT/AdapterForm.cs
index 06baa353..265003a0 100644
--- a/IOB-WIN-NEXT/AdapterForm.cs
+++ b/IOB-WIN-NEXT/AdapterForm.cs
@@ -3,6 +3,7 @@ using MapoSDK;
 using Newtonsoft.Json;
 using NLog;
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Drawing;
@@ -465,11 +466,13 @@ namespace IOB_WIN_NEXT
                 try
                 {
                     // aggiungo in testa la NUOVA stringa (eventualmente multiline)
-                    logWatchString.Insert(0, value);
+                    logWatchString.Enqueue(value);
                     // se supero limite --> trim!
-                    if (logWatchString.Count > nLine2show)
+                    string sTemp = "";
+                    while (logWatchString.Count > nLine2show)
                     {
-                        logWatchString = logWatchString.Take(nLine2show).ToList();
+                        logWatchString.TryDequeue(out sTemp);
+                        //logWatchString = logWatchString.Take(nLine2show).ToList();
                     }
                     DateTime adesso = DateTime.Now;
                     if (logWatchWriteVeto < adesso)
@@ -1031,7 +1034,7 @@ namespace IOB_WIN_NEXT
         /// <summary>
         /// Lista String da mostrare quale WatchLog corrente...
         /// </summary>
-        protected List<string> logWatchString { get; set; } = new List<string>();
+        protected ConcurrentQueue<string> logWatchString { get; set; } = new ConcurrentQueue<string>();
 
         /// <summary>
         /// Veto a NUOVE scritture in logWatch...