diff --git a/crates/trie/trie/src/proof_v2/mod.rs b/crates/trie/trie/src/proof_v2/mod.rs
index 8861def8a5..0696ca1668 100644
--- a/crates/trie/trie/src/proof_v2/mod.rs
+++ b/crates/trie/trie/src/proof_v2/mod.rs
@@ -105,10 +105,10 @@ impl<TC, HC, VE: LeafValueEncoder> ProofCalculator<TC, HC, VE> {
             hashed_cursor,
             branch_stack: Vec::<_>::with_capacity(64),
             branch_path: Nibbles::new(),
-            child_stack: Vec::<_>::new(),
+            child_stack: Vec::<_>::with_capacity(64),
             cached_branch_stack: Vec::<_>::with_capacity(64),
-            retained_proofs: Vec::<_>::new(),
-            rlp_nodes_bufs: Vec::<_>::new(),
+            retained_proofs: Vec::<_>::with_capacity(32),
+            rlp_nodes_bufs: Vec::<_>::with_capacity(8),
             rlp_encode_buf: Vec::<_>::with_capacity(RLP_ENCODE_BUF_SIZE),
         }
     }