diff --git a/MP.SPEC/Components/LoadingDataSmall.razor b/MP.SPEC/Components/LoadingDataSmall.razor
index 196dafc7..2217cf02 100644
--- a/MP.SPEC/Components/LoadingDataSmall.razor
+++ b/MP.SPEC/Components/LoadingDataSmall.razor
@@ -1,5 +1,5 @@
-<div class="row p-2 m-2">
-    <div class="col-12 text-center mt-2 py-2 alert alert-primary">
+<div class="row p-0 m-0">
+    <div class="col-12 text-center py-2 mb-0 alert alert-primary">
         <b>loading data</b>
         <i class="fas fa-spinner fa-spin"></i>
     </div>
diff --git a/MP.SPEC/Pages/PARAMS.razor b/MP.SPEC/Pages/PARAMS.razor
index c586d536..3c2d1380 100644
--- a/MP.SPEC/Pages/PARAMS.razor
+++ b/MP.SPEC/Pages/PARAMS.razor
@@ -7,7 +7,14 @@
                 <h3><b>PARAMETERS</b></h3>
             </div>
             <div class="px-2 flex-fill">
-                <ParamsFilter FilterChanged="updateFilter"></ParamsFilter>
+                @if (isFiltering)
+                {
+                    <LoadingDataSmall></LoadingDataSmall>
+                }
+                else
+                {
+                    <ParamsFilter FilterChanged="updateFilter"></ParamsFilter>
+                }
             </div>
         </div>
     </div>
diff --git a/MP.SPEC/Pages/PARAMS.razor.cs b/MP.SPEC/Pages/PARAMS.razor.cs
index b6505e4a..fa828e97 100644
--- a/MP.SPEC/Pages/PARAMS.razor.cs
+++ b/MP.SPEC/Pages/PARAMS.razor.cs
@@ -33,15 +33,24 @@ namespace MP.SPEC.Pages
             StateHasChanged();
         }
 
-        protected override void OnInitialized()
+        protected override async Task OnInitializedAsync()
         {
             isLoading = true;
+            isFiltering = true;
+#if false
+            await InvokeAsync(() => StateHasChanged()); 
+#endif
             // disabilito ricerca...
             MsgService.SearchVal = "";
             MsgService.ShowSearch = false;
             // fix pagina
-            currFilter.CurrPage = 1;
-            currFilter.LiveUpdate = (currPage == 1);
+            await Task.Delay(1);
+            var modFilter = currFilter;
+            modFilter.CurrPage = 1;
+            modFilter.LiveUpdate = (currPage == 1);
+            currFilter = modFilter;
+            await Task.Delay(1);
+            isFiltering = false;
         }
 
         protected async Task pgResetReq(bool doReset)
@@ -75,6 +84,7 @@ namespace MP.SPEC.Pages
         }
 
         private bool isLoading { get; set; } = true;
+        private bool isFiltering { get; set; } = false;
 
         private int numRecord
         {
@@ -90,20 +100,22 @@ namespace MP.SPEC.Pages
 
         private async Task updateFilter(SelectFluxParams newParams)
         {
+            isFiltering = false;
             isLoading = true;
-            currFilter = newParams;
+            await Task.Delay(1);
             currPage = 1;
             if (newParams.CurrPage == 0)
             {
-                currFilter.CurrPage = 1;
-                currFilter.LiveUpdate = false;
+                newParams.CurrPage = 1;
+                newParams.LiveUpdate = false;
             }
             else
             {
-                currFilter.LiveUpdate = (currPage == 1);
+                newParams.LiveUpdate = (currPage == 1);
             }
             await Task.Delay(1);
             await InvokeAsync(() => StateHasChanged());
+            currFilter = newParams;
             isLoading = false;
         }