diff --git a/Include/MyIncludes/StochasticSlow_Calculator.mqh b/Include/MyIncludes/StochasticSlow_Calculator.mqh
index f2286dd..bfa8db4 100644
--- a/Include/MyIncludes/StochasticSlow_Calculator.mqh
+++ b/Include/MyIncludes/StochasticSlow_Calculator.mqh
@@ -1,6 +1,6 @@
 //+------------------------------------------------------------------+
 //|                                     StochasticSlow_Calculator.mqh|
-//| Calculation engine for Standard and Heikin Ashi Slow Stochastic. |
+//|      VERSION 1.20: Optimized for incremental calculation.        |
 //|                                        Copyright 2025, xxxxxxxx  |
 //+------------------------------------------------------------------+
 #property copyright "Copyright 2025, xxxxxxxx"
@@ -8,33 +8,37 @@
 #include <MyIncludes\HeikinAshi_Tools.mqh>
 
 //+==================================================================+
-//|                                                                  |
 //|           CLASS 1: CStochasticSlowCalculator (Base Class)        |
-//|                                                                  |
 //+==================================================================+
 class CStochasticSlowCalculator
   {
 protected:
    int               m_k_period, m_d_period, m_slowing_period;
    ENUM_MA_METHOD    m_slowing_ma_type, m_d_ma_type;
+
+   //--- Persistent Buffers for Incremental Calculation
    double            m_src_high[], m_src_low[], m_src_close[];
+   double            m_raw_k[]; // Stores Fast %K
 
    double            Highest(int period, int current_pos);
    double            Lowest(int period, int current_pos);
 
-   virtual bool      PrepareSourceData(int rates_total, const double &open[], const double &high[], const double &low[], const double &close[]);
+   //--- Updated: Accepts start_index
+   virtual bool      PrepareSourceData(int rates_total, int start_index, const double &open[], const double &high[], const double &low[], const double &close[]);
 
 public:
                      CStochasticSlowCalculator(void) {};
    virtual          ~CStochasticSlowCalculator(void) {};
 
    bool              Init(int k_p, int slow_p, ENUM_MA_METHOD slow_ma, int d_p, ENUM_MA_METHOD d_ma);
-   void              Calculate(int rates_total, const double &open[], const double &high[], const double &low[], const double &close[],
+
+   //--- Updated: Accepts prev_calculated
+   void              Calculate(int rates_total, int prev_calculated, const double &open[], const double &high[], const double &low[], const double &close[],
                                double &k_buffer[], double &d_buffer[]);
   };
 
 //+------------------------------------------------------------------+
-//| CStochasticSlowCalculator: Initialization                        |
+//| Init                                                             |
 //+------------------------------------------------------------------+
 bool CStochasticSlowCalculator::Init(int k_p, int slow_p, ENUM_MA_METHOD slow_ma, int d_p, ENUM_MA_METHOD d_ma)
   {
@@ -47,34 +51,54 @@ bool CStochasticSlowCalculator::Init(int k_p, int slow_p, ENUM_MA_METHOD slow_ma
   }
 
 //+------------------------------------------------------------------+
-//| CStochasticSlowCalculator: Main Calculation Method (Shared Logic)|
+//| Main Calculation (Optimized)                                     |
 //+------------------------------------------------------------------+
-void CStochasticSlowCalculator::Calculate(int rates_total, const double &open[], const double &high[], const double &low[], const double &close[],
+void CStochasticSlowCalculator::Calculate(int rates_total, int prev_calculated, const double &open[], const double &high[], const double &low[], const double &close[],
       double &k_buffer[], double &d_buffer[])
   {
    if(rates_total <= m_k_period + m_slowing_period + m_d_period)
       return;
-   if(!PrepareSourceData(rates_total, open, high, low, close))
+
+//--- 1. Determine Start Index
+   int start_index;
+   if(prev_calculated == 0)
+      start_index = 0;
+   else
+      start_index = prev_calculated - 1;
+
+//--- 2. Resize Buffers
+   if(ArraySize(m_src_high) != rates_total)
+     {
+      ArrayResize(m_src_high, rates_total);
+      ArrayResize(m_src_low, rates_total);
+      ArrayResize(m_src_close, rates_total);
+      ArrayResize(m_raw_k, rates_total);
+     }
+
+//--- 3. Prepare Source Data (Optimized)
+   if(!PrepareSourceData(rates_total, start_index, open, high, low, close))
       return;
 
-   double raw_k[];
-   ArrayResize(raw_k, rates_total);
+//--- 4. Calculate Raw %K (Fast %K)
+   int loop_start_k = MathMax(m_k_period - 1, start_index);
 
-//--- STEP 1: Calculate Raw %K (Fast %K)
-   for(int i = m_k_period - 1; i < rates_total; i++)
+   for(int i = loop_start_k; i < rates_total; i++)
      {
       double highest_h = Highest(m_k_period, i);
       double lowest_l  = Lowest(m_k_period, i);
       double range = highest_h - lowest_l;
+
       if(range > 0)
-         raw_k[i] = (m_src_close[i] - lowest_l) / range * 100.0;
+         m_raw_k[i] = (m_src_close[i] - lowest_l) / range * 100.0;
       else
-         raw_k[i] = (i > 0) ? raw_k[i-1] : 50.0;
+         m_raw_k[i] = (i > 0) ? m_raw_k[i-1] : 50.0;
      }
 
-//--- STEP 2: Calculate Slow %K (Main Line) by smoothing Raw %K
+//--- 5. Calculate Slow %K (Main Line)
    int k_slow_start = m_k_period + m_slowing_period - 2;
-   for(int i = k_slow_start; i < rates_total; i++)
+   int loop_start_slow = MathMax(k_slow_start, start_index);
+
+   for(int i = loop_start_slow; i < rates_total; i++)
      {
       switch(m_slowing_ma_type)
         {
@@ -84,7 +108,7 @@ void CStochasticSlowCalculator::Calculate(int rates_total, const double &open[],
               {
                double sum=0;
                for(int j=0; j<m_slowing_period; j++)
-                  sum+=raw_k[i-j];
+                  sum+=m_raw_k[i-j];
                k_buffer[i]=sum/m_slowing_period;
               }
             else
@@ -92,24 +116,26 @@ void CStochasticSlowCalculator::Calculate(int rates_total, const double &open[],
                if(m_slowing_ma_type==MODE_EMA)
                  {
                   double pr=2.0/(m_slowing_period+1.0);
-                  k_buffer[i]=raw_k[i]*pr+k_buffer[i-1]*(1.0-pr);
+                  k_buffer[i]=m_raw_k[i]*pr+k_buffer[i-1]*(1.0-pr);
                  }
                else
-                  k_buffer[i]=(k_buffer[i-1]*(m_slowing_period-1)+raw_k[i])/m_slowing_period;
+                  k_buffer[i]=(k_buffer[i-1]*(m_slowing_period-1)+m_raw_k[i])/m_slowing_period;
               }
             break;
          case MODE_LWMA:
-           {double sum=0,w_sum=0; for(int j=0; j<m_slowing_period; j++) {int w=m_slowing_period-j; sum+=raw_k[i-j]*w; w_sum+=w;} if(w_sum>0) k_buffer[i]=sum/w_sum;}
+           {double sum=0,w_sum=0; for(int j=0; j<m_slowing_period; j++) {int w=m_slowing_period-j; sum+=m_raw_k[i-j]*w; w_sum+=w;} if(w_sum>0) k_buffer[i]=sum/w_sum;}
          break;
          default:
-           {double sum=0; for(int j=0; j<m_slowing_period; j++) sum+=raw_k[i-j]; k_buffer[i]=sum/m_slowing_period;}
+           {double sum=0; for(int j=0; j<m_slowing_period; j++) sum+=m_raw_k[i-j]; k_buffer[i]=sum/m_slowing_period;}
          break;
         }
      }
 
-//--- STEP 3: Calculate %D (Signal Line) by smoothing Slow %K
+//--- 6. Calculate %D (Signal Line)
    int d_start = m_k_period + m_slowing_period + m_d_period - 3;
-   for(int i = d_start; i < rates_total; i++)
+   int loop_start_d = MathMax(d_start, start_index);
+
+   for(int i = loop_start_d; i < rates_total; i++)
      {
       switch(m_d_ma_type)
         {
@@ -144,21 +170,22 @@ void CStochasticSlowCalculator::Calculate(int rates_total, const double &open[],
   }
 
 //+------------------------------------------------------------------+
-//| CStochasticSlowCalculator: Prepares the standard source data.    |
+//| Prepare Source Data (Standard - Optimized)                       |
 //+------------------------------------------------------------------+
-bool CStochasticSlowCalculator::PrepareSourceData(int rates_total, const double &open[], const double &high[], const double &low[], const double &close[])
+bool CStochasticSlowCalculator::PrepareSourceData(int rates_total, int start_index, const double &open[], const double &high[], const double &low[], const double &close[])
   {
-   ArrayResize(m_src_high, rates_total);
-   ArrayCopy(m_src_high, high, 0, 0, rates_total);
-   ArrayResize(m_src_low, rates_total);
-   ArrayCopy(m_src_low, low, 0, 0, rates_total);
-   ArrayResize(m_src_close, rates_total);
-   ArrayCopy(m_src_close, close, 0, 0, rates_total);
+// Optimized copy loop
+   for(int i = start_index; i < rates_total; i++)
+     {
+      m_src_high[i]  = high[i];
+      m_src_low[i]   = low[i];
+      m_src_close[i] = close[i];
+     }
    return true;
   }
 
 //+------------------------------------------------------------------+
-//| Finds the highest value in the internal price buffer.            |
+//| Highest                                                          |
 //+------------------------------------------------------------------+
 double CStochasticSlowCalculator::Highest(int period, int current_pos)
   {
@@ -175,7 +202,7 @@ double CStochasticSlowCalculator::Highest(int period, int current_pos)
   }
 
 //+------------------------------------------------------------------+
-//| Finds the lowest value in the internal price buffer.             |
+//| Lowest                                                           |
 //+------------------------------------------------------------------+
 double CStochasticSlowCalculator::Lowest(int period, int current_pos)
   {
@@ -192,30 +219,44 @@ double CStochasticSlowCalculator::Lowest(int period, int current_pos)
   }
 
 //+==================================================================+
-//|                                                                  |
 //|         CLASS 2: CStochasticSlowCalculator_HA (Heikin Ashi)      |
-//|                                                                  |
 //+==================================================================+
 class CStochasticSlowCalculator_HA : public CStochasticSlowCalculator
   {
 private:
    CHeikinAshi_Calculator m_ha_calculator;
+   // Internal HA buffers
+   double            m_ha_open[], m_ha_high_temp[], m_ha_low_temp[], m_ha_close_temp[];
+
 protected:
-   virtual bool      PrepareSourceData(int rates_total, const double &open[], const double &high[], const double &low[], const double &close[]) override;
+   virtual bool      PrepareSourceData(int rates_total, int start_index, const double &open[], const double &high[], const double &low[], const double &close[]) override;
   };
 
 //+------------------------------------------------------------------+
-//| CStochasticSlowCalculator_HA: Prepares the HA source data.       |
+//| Prepare Source Data (Heikin Ashi - Optimized)                    |
 //+------------------------------------------------------------------+
-bool CStochasticSlowCalculator_HA::PrepareSourceData(int rates_total, const double &open[], const double &high[], const double &low[], const double &close[])
+bool CStochasticSlowCalculator_HA::PrepareSourceData(int rates_total, int start_index, const double &open[], const double &high[], const double &low[], const double &close[])
   {
-   double ha_open[];
-   ArrayResize(ha_open, rates_total);
-   ArrayResize(m_src_high, rates_total);
-   ArrayResize(m_src_low, rates_total);
-   ArrayResize(m_src_close, rates_total);
-   m_ha_calculator.Calculate(rates_total, open, high, low, close, ha_open, m_src_high, m_src_low, m_src_close);
+// Resize internal HA buffers
+   if(ArraySize(m_ha_open) != rates_total)
+     {
+      ArrayResize(m_ha_open, rates_total);
+      ArrayResize(m_ha_high_temp, rates_total);
+      ArrayResize(m_ha_low_temp, rates_total);
+      ArrayResize(m_ha_close_temp, rates_total);
+     }
+
+//--- STRICT CALL: Use the optimized 10-param HA calculation
+   m_ha_calculator.Calculate(rates_total, start_index, open, high, low, close,
+                             m_ha_open, m_ha_high_temp, m_ha_low_temp, m_ha_close_temp);
+
+//--- Copy to source buffers (Optimized loop)
+   for(int i = start_index; i < rates_total; i++)
+     {
+      m_src_high[i]  = m_ha_high_temp[i];
+      m_src_low[i]   = m_ha_low_temp[i];
+      m_src_close[i] = m_ha_close_temp[i];
+     }
    return true;
   }
 //+------------------------------------------------------------------+
-//+------------------------------------------------------------------+