diff --git a/core/state/statedb.go b/core/state/statedb.go
index b89f4bfd8..a4e22baaf 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -783,13 +783,13 @@ func (s *StateDB) Copy() *StateDB {
 		state.snap = s.snap
 
 		// deep copy needed
-		state.snapAccounts = make(map[common.Hash][]byte)
+		state.snapAccounts = make(map[common.Hash][]byte, len(s.snapAccounts))
 		for k, v := range s.snapAccounts {
 			state.snapAccounts[k] = v
 		}
-		state.snapStorage = make(map[common.Hash]map[common.Hash][]byte)
+		state.snapStorage = make(map[common.Hash]map[common.Hash][]byte, len(s.snapStorage))
 		for k, v := range s.snapStorage {
-			temp := make(map[common.Hash][]byte)
+			temp := make(map[common.Hash][]byte, len(v))
 			for kk, vv := range v {
 				temp[kk] = vv
 			}
@@ -1160,7 +1160,7 @@ func (s *StateDB) SlotInAccessList(addr common.Address, slot common.Hash) (addre
 
 // convertAccountSet converts a provided account set from address keyed to hash keyed.
 func (s *StateDB) convertAccountSet(set map[common.Address]struct{}) map[common.Hash]struct{} {
-	ret := make(map[common.Hash]struct{})
+	ret := make(map[common.Hash]struct{}, len(set))
 	for addr := range set {
 		obj, exist := s.stateObjects[addr]
 		if !exist {