diff --git a/core/src/banking_stage.rs b/core/src/banking_stage.rs
index 6b316968171341..a6128001f0b74b 100644
--- a/core/src/banking_stage.rs
+++ b/core/src/banking_stage.rs
@@ -265,7 +265,7 @@ pub enum BufferedPacketsDecision {
 
 pub struct CommittedTransactionBatch {
     pub transactions: Vec<Transaction>,
-    pub statuses: Vec<TransactionExecutionResult>,
+    pub execution_results: Vec<TransactionExecutionResult>,
 }
 
 impl BankingStage {
@@ -751,9 +751,9 @@ impl BankingStage {
             }
             // */
 
-            for (txs, execution_results) in cost_update_receiver.try_iter() {
-                for ((result, _), tx) in execution_results.iter().zip(txs.iter()) {
-                    if result.0.is_ok() {
+            for batch in cost_update_receiver.try_iter() {
+                for ((result, _), tx) in batch.execution_results.iter().zip(batch.transactions.iter()) {
+                    if result.is_ok() {
                         cost_model
                             .read()
                             .unwrap()
@@ -1018,10 +1018,13 @@ impl BankingStage {
             }
 
             // track committed transactions' cost
-            let transactions = batch.transaction_iter().cloned().collect();
-            cost_tracker_update_sender.send(CommittedTransactionBatch {transactions, tx_results.execution_results}
-            ).expect("send committed transactions to update cost model");
-            
+            let transactions = batch.transactions_iter().cloned().collect();
+            let execution_results = results.to_vec();
+            cost_tracker_update_sender.send(
+                CommittedTransactionBatch {
+                    transactions, 
+                    execution_results, 
+            } ).expect("send committed transactions to update cost model");
         }
         commit_time.stop();
 
@@ -1113,7 +1116,7 @@ impl BankingStage {
                 chunk_start,
                 transaction_status_sender.clone(),
                 gossip_vote_sender,
-                cost_tracker_update_sender,
+                cost_tracker_update_sender.clone(),
             );
             trace!("process_transactions result: {:?}", result);
 
@@ -1361,32 +1364,20 @@ impl BankingStage {
             unprocessed_tx_count
         );
 
-        // applying cost of processed transactions to shared cost_tracker
         let mut cost_tracking_time = Measure::start("cost_tracking_time");
-        /* TODO TAO - replaced
-        let mut tx_cost = TransactionCost::new_with_capacity(MAX_WRITABLE_ACCOUNTS);
-        // */
+        /* TODO TAO - doing in batch fashino right after committing, to 
+         * save 1) nested for-loop, 2) individual transaction cloning
+        // applying cost of processed transactions to shared cost_tracker
         {
-            //let cost_model_readonly = cost_model.read().unwrap();
-            //let mut cost_tracker_mutable = cost_tracker.write().unwrap();
             transactions.iter().enumerate().for_each(|(index, tx)| {
                 if !unprocessed_tx_indexes.iter().any(|&i| i == index) {
                     cost_update_sender
                         .send(tx.transaction().clone())
                         .expect("send transaction to cost_model");
-                    /* TODO TAO - replaced
-                    cost_model
-                        .read()
-                        .unwrap()
-                        .calculate_cost_no_alloc(tx.transaction(), &mut tx_cost);
-                    cost_tracker.write().unwrap().add_transaction(
-                        &tx_cost.writable_accounts,
-                        &(tx_cost.account_access_cost + tx_cost.execution_cost),
-                    );
-                    // */
                 }
             });
         }
+        // */
         cost_tracking_time.stop();
 
         let mut filter_pending_packets_time = Measure::start("filter_pending_packets_time");