diff --git a/EgwCoreLib.BlazorTest/Pages/TestLoading.razor b/EgwCoreLib.BlazorTest/Pages/TestLoading.razor
index 9e66ea2..e9bdada 100644
--- a/EgwCoreLib.BlazorTest/Pages/TestLoading.razor
+++ b/EgwCoreLib.BlazorTest/Pages/TestLoading.razor
@@ -11,4 +11,4 @@
 </div>
 <button class="btn btn-success" @onclick="StartLongTimer">Start</button>
 
-<ProgressDisplay RefreshInterval="100" Title="@titleMsg" MaxVal="@maxVal" CurrVal="@currVal" NextVal="@nextVal" ExpTimeMSec="@expTimeMSec" DisplaySize="ProgressDisplay.ModalSize.Medium" ModalCss="card alert-primary"></ProgressDisplay>
+<ProgressDisplay RefreshInterval="100" Title="@titleMsg" MaxVal="@maxVal" CurrVal="@currVal" NextVal="@nextVal" ExpTimeMSec="@expTimeMSec" DisplaySize="ProgressDisplay.ModalSize.Medium" ModalCss="card alert-primary" SlowLimit="0.4"></ProgressDisplay>
diff --git a/EgwCoreLib.Razor/ProgressDisplay.razor.cs b/EgwCoreLib.Razor/ProgressDisplay.razor.cs
index db4435b..a3bf777 100644
--- a/EgwCoreLib.Razor/ProgressDisplay.razor.cs
+++ b/EgwCoreLib.Razor/ProgressDisplay.razor.cs
@@ -90,12 +90,22 @@ namespace EgwCoreLib.Razor
         public bool ShowPercent { get; set; } = true;
 
         /// <summary>
-        /// Numero di secondi prima (rispetto valore ExpTimeMsec) da cui iniziare rallentamento
+        /// Limite per anticipo slowdown (% della durata di ExpTimeMSec)
         /// </summary>
         [Parameter]
-        public int SlowWindowMSec { get; set; } = 3000;
+        public double SlowLimit { get; set; } = 0.5;
 
-        //Titolo da mostrare (se "" NON lo mostra)
+        /// <summary>
+        /// Numero di secondi prima (rispetto valore ExpTimeMsec) da cui iniziare rallentamento
+        /// </summary>
+        private int slowWindowMSec
+        {
+            get => (int)(ExpTimeMSec * SlowLimit);
+        }
+
+        /// <summary>
+        /// Titolo da mostrare (se "" NON lo mostra)
+        /// </summary>
         [Parameter]
         public string Title { get; set; } = "Progress";
 
@@ -203,9 +213,9 @@ namespace EgwCoreLib.Razor
                 if (isLoading)
                 {
                     DateTime adesso = DateTime.Now;
-                    if (nextUpdate <= adesso.AddMilliseconds(SlowWindowMSec))
+                    if (nextUpdate <= adesso.AddMilliseconds(slowWindowMSec))
                     {
-                        nextUpdate = adesso.AddMilliseconds(RefreshInterval);
+                        nextUpdate = adesso.AddMilliseconds(RefreshInterval*2);
                     }
                     // calcolo delta ms...
                     var numMs = adesso.Subtract(lastUpdate).TotalMilliseconds;