diff --git a/App.tsx b/App.tsx
index f7fb492..ca9ea31 100644
--- a/App.tsx
+++ b/App.tsx
@@ -45,6 +45,7 @@ const PERMANENT_DROPBOX_URL = "https://www.dropbox.com/scl/fi/b9zxn4z5i7sxwfakk5
 const PERMANENT_ADS_URL = "https://www.dropbox.com/scl/fi/wng8tep7awhvzd65amwad/Ads-Weekly.xlsx?rlkey=kcmoq8dxgibsb2eb8zz47xvyo&st=z02m4w3g&dl=0";
 
 const App: React.FC = () => {
+  console.log('[App] Rendering Function Start');
   const [rawData, setRawData] = useState<SalesRecord[]>([]);
   const [adsData, setAdsData] = useState<AdsRecord[]>([]);
   const [trafficData, setTrafficData] = useState<TrafficRecord[]>([]);
diff --git a/components/DataGrid.tsx b/components/DataGrid.tsx
index 24f793e..cb30d1b 100644
--- a/components/DataGrid.tsx
+++ b/components/DataGrid.tsx
@@ -963,7 +963,7 @@ const DataGrid: React.FC<DataGridProps> = ({ data, filters, hasCustomerFilter, a
                                                             if (selectedDimensions.includes(dim.value)) {
                                                                 setSelectedDimensions(selectedDimensions.filter(d => d !== dim.value));
                                                             } else {
-                                                                setSelectedDimensions([...selectedDimensions, dim.value]);
+                                                                setSelectedDimensions(selectedDimensions.concat([dim.value]));
                                                             }
                                                         }}
                                                         className="w-4.5 h-4.5 rounded-md border-slate-600 bg-slate-800 text-indigo-500 focus:ring-indigo-500/50 focus:ring-offset-0 transition-all border-2 cursor-pointer"
diff --git a/components/MultiSelectDropdown.tsx b/components/MultiSelectDropdown.tsx
index 66e55e2..3cdc6ba 100644
--- a/components/MultiSelectDropdown.tsx
+++ b/components/MultiSelectDropdown.tsx
@@ -60,8 +60,8 @@ const MultiSelectDropdown: React.FC<MultiSelectDropdownProps> = ({ label, select
 
   const toggleOption = (option: string) => {
     const next = localSelected.includes(option)
-      ? localSelected.filter((item) => item !== option)
-      : [...localSelected, option];
+      ? localSelected.filter(item => item !== option)
+      : localSelected.concat([option]);
     setLocalSelected(next);
     onChange(next);
   };
@@ -72,9 +72,9 @@ const MultiSelectDropdown: React.FC<MultiSelectDropdownProps> = ({ label, select
       const allFilteredSelected = filteredOptions.every(opt => localSelected.includes(opt));
       next = allFilteredSelected
         ? localSelected.filter(item => !filteredOptions.includes(item))
-        : Array.from(new Set([...localSelected, ...filteredOptions]));
+        : Array.from(new Set(localSelected.slice().concat(filteredOptions)));
     } else {
-      next = localSelected.length === options.length ? [] : [...options];
+      next = localSelected.length === options.length ? [] : options.slice();
     }
     setLocalSelected(next);
     onChange(next);
@@ -190,7 +190,7 @@ const MultiSelectDropdown: React.FC<MultiSelectDropdownProps> = ({ label, select
                         termsLower.some(t => opt.toLowerCase() === t || opt.toLowerCase().includes(t))
                       );
                       if (matched.length > 0) {
-                        const next = Array.from(new Set([...localSelected, ...matched]));
+                        const next = Array.from(new Set(localSelected.slice().concat(matched)));
                         setLocalSelected(next);
                         onChange(next);
                       }
@@ -202,7 +202,7 @@ const MultiSelectDropdown: React.FC<MultiSelectDropdownProps> = ({ label, select
                       if (allSelected) {
                         next = localSelected.filter(item => !filteredOptions.includes(item));
                       } else {
-                        next = Array.from(new Set([...localSelected, ...filteredOptions]));
+                        next = Array.from(new Set(localSelected.slice().concat(filteredOptions)));
                       }
                       setLocalSelected(next);
                       onChange(next);
diff --git a/components/WeeklyGrid.tsx b/components/WeeklyGrid.tsx
index f1780ca..f8393fd 100644
--- a/components/WeeklyGrid.tsx
+++ b/components/WeeklyGrid.tsx
@@ -506,7 +506,7 @@ const WeeklyGrid: React.FC<WeeklyGridProps & { top50Mode: 'eu' | 'uk' }> = ({
             const filtered = prev.filter(f => !(f.week === week && f.metric === metric));
             // Add new filter if provided
             if (filter) {
-                return [...filtered, filter];
+                return filtered.concat([filter]);
             }
             return filtered;
         });