diff --git a/core/parallel_state_processor.go b/core/parallel_state_processor.go
index c980e0b6e0..bd2b2ccd5a 100644
--- a/core/parallel_state_processor.go
+++ b/core/parallel_state_processor.go
@@ -96,21 +96,13 @@ func (p *ParallelStateProcessor) executeParallel(block *types.Block, statedb *st
 		preStateProvider PreStateProvider
 		workers          errgroup.Group
 		postState        = statedb.Copy()
-		// statedbbal       = statedb.Copy()
-		// wg sync.WaitGroup
 	)
 	// leave some cpus for prefetching
 	workers.SetLimit(runtime.NumCPU() / 2)
 
-	// Fetch prestate for each tx
-
-	// todo: handle gp with RW lock
 	switch preStateType {
 	case BALPreState:
 		{
-			// start := time.Now()
-			// statedb.PrefetchStateBAL(block.NumberU64())
-			// PrefetchBALTime += time.Since(start)
 		}
 
 	case SeqPreState:
@@ -195,8 +187,7 @@ func (p *ParallelStateProcessor) executeParallel(block *types.Block, statedb *st
 	// Merge state changes
 	// - Append receipts
 	// - Sum usedGas
-	// - Collect state state changes: simple overwrite
-	// - Ommit preimages for now
+	// - TODO: validate state changes are the same with bal
 	usedGas := uint64(0)
 
 	// set it to avoid read bal post state, -2 is a magic tx number
diff --git a/core/state/statedb.go b/core/state/statedb.go
index e7dee7de5c..0032463f0a 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -473,56 +473,6 @@ func (s *StateDB) MergePostBal() {
 	}
 }
 
-func (s *StateDB) MergePostBalBuggy() {
-	if balType != BalPreblockKeysPostValues {
-		panic("MergePostBal is only supported with BalPreblockKeysPostValues")
-	}
-	start := time.Now()
-	var (
-		postBal = AllBlockTxPostValues[s.blockNumber]
-	)
-	StateLoadTime += time.Since(start)
-
-	postState := s.Copy()
-	postState.prefetcher = nil
-	for txIndex := range len(postBal) {
-		postVals := postBal[txIndex]
-		start := time.Now()
-		for addr, acct := range postVals {
-			account := postState.getStateObject(addr)
-			if account == nil {
-				return
-			}
-
-			if acct.Destruct {
-				account.markSelfdestructed()
-				continue
-			}
-
-			account.SetNonce(acct.Nonce)
-			if acct.Balance != nil {
-				account.SetBalance(acct.Balance)
-			}
-			if acct.Code != nil {
-				account.SetCode(crypto.Keccak256Hash(acct.Code), acct.Code)
-			}
-			// Will cause failure if postState.Finalise is not called.
-			for k, v := range acct.StorageKV {
-				account.SetState(k, v)
-			}
-		}
-		StateSetTime += time.Since(start)
-
-		start = time.Now()
-		// postState.Finalise(true)
-		StateFinalizeTime += time.Since(start)
-
-		start = time.Now()
-		s.postStates[txIndex] = postState.Copy()
-		StateCopyTime += time.Since(start)
-	}
-}
-
 func (s *StateDB) PrestateAtIndex(txIndex int) (*StateDB, error) {
 	if balType != BalPreblockKeysPostValues {
 		return nil, fmt.Errorf("PreStateAtTxIndex is only supported with BalPreblockKeysPostValues")