diff --git a/Indicators/MyIndicators/Bollinger_Bands_Pro.mq5 b/Indicators/MyIndicators/Bollinger_Bands_Pro.mq5
index 6ddf267..e8bf7ce 100644
--- a/Indicators/MyIndicators/Bollinger_Bands_Pro.mq5
+++ b/Indicators/MyIndicators/Bollinger_Bands_Pro.mq5
@@ -1,10 +1,9 @@
 //+------------------------------------------------------------------+
 //|                                          Bollinger_Bands_Pro.mq5 |
 //|                                          Copyright 2025, xxxxxxxx|
-//|                                                                  |
 //+------------------------------------------------------------------+
 #property copyright "Copyright 2025, xxxxxxxx"
-#property version   "1.00"
+#property version   "1.10" // Optimized for incremental calculation
 #property description "A professional, unified Bollinger Bands indicator with a selectable"
 #property description "price source, including a full range of Heikin Ashi prices."
 
@@ -96,20 +95,29 @@ void OnDeinit(const int reason)
   }
 
 //+------------------------------------------------------------------+
-//| Custom indicator iteration function.                             |
+//| Custom indicator calculation function                            |
 //+------------------------------------------------------------------+
-int OnCalculate(const int rates_total, const int, const datetime&[], const double &open[], const double &high[], const double &low[], const double &close[], const long&[], const long&[], const int&[])
+int OnCalculate(const int rates_total,
+                const int prev_calculated, // <--- Now used!
+                const datetime &time[],
+                const double &open[],
+                const double &high[],
+                const double &low[],
+                const double &close[],
+                const long &tick_volume[],
+                const long &volume[],
+                const int &spread[])
   {
    if(CheckPointer(g_calculator) != POINTER_INVALID)
      {
-      //--- Convert our custom enum back to a standard ENUM_APPLIED_PRICE for the calculator
       ENUM_APPLIED_PRICE price_type;
       if(InpSourcePrice <= PRICE_HA_CLOSE)
-         price_type = (ENUM_APPLIED_PRICE)(-(int)InpSourcePrice); // Convert -1 to 1 (CLOSE), -2 to 2 (OPEN) etc.
+         price_type = (ENUM_APPLIED_PRICE)(-(int)InpSourcePrice);
       else
          price_type = (ENUM_APPLIED_PRICE)InpSourcePrice;
 
-      g_calculator.Calculate(rates_total, price_type, open, high, low, close,
+      //--- Delegate calculation with prev_calculated optimization
+      g_calculator.Calculate(rates_total, prev_calculated, price_type, open, high, low, close,
                              BufferCenterLine, BufferUpperBand, BufferLowerBand);
      }
    return(rates_total);