diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83819f89e..1bc4893b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Next release
 
+- perf: improved perfs with parallelized iteration over tx hashes cache
 - fix: graceful shutdown of rocksdb on ctrl+c
 - fix: better error handling around l1 and l2 sync
 - perf: compile with target_cpu=skylake by default
diff --git a/Cargo.lock b/Cargo.lock
index 97e100b92..8e40a2d41 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6163,6 +6163,7 @@ dependencies = [
  "mp-types",
  "num-traits 0.2.18",
  "pallet-starknet-runtime-api",
+ "rayon",
  "sc-client-api",
  "sp-api",
  "sp-blockchain",
diff --git a/crates/client/mapping-sync/Cargo.toml b/crates/client/mapping-sync/Cargo.toml
index 72e2e7923..eafa3e654 100644
--- a/crates/client/mapping-sync/Cargo.toml
+++ b/crates/client/mapping-sync/Cargo.toml
@@ -29,6 +29,7 @@ mp-types = { workspace = true }
 num-traits = { workspace = true }
 pallet-starknet-runtime-api = { workspace = true }
 prometheus-endpoint = { workspace = true }
+rayon = { workspace = true }
 sc-client-api = { workspace = true }
 sp-api = { workspace = true }
 sp-blockchain = { workspace = true }
diff --git a/crates/client/mapping-sync/src/sync_blocks.rs b/crates/client/mapping-sync/src/sync_blocks.rs
index d949eb55e..7d7912eb2 100644
--- a/crates/client/mapping-sync/src/sync_blocks.rs
+++ b/crates/client/mapping-sync/src/sync_blocks.rs
@@ -11,6 +11,7 @@ use mp_types::block::{DBlockT, DHashT, DHeaderT};
 use num_traits::FromPrimitive;
 use pallet_starknet_runtime_api::StarknetRuntimeApi;
 use prometheus_endpoint::prometheus::core::Number;
+use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
 use sc_client_api::backend::{Backend, StorageProvider};
 use sp_api::ProvideRuntimeApi;
 use sp_blockchain::{Backend as _, HeaderBackend};
@@ -38,8 +39,10 @@ where
             let opt_storage_starknet_block = get_block_by_block_hash(client, substrate_block_hash);
             match opt_storage_starknet_block {
                 Ok(storage_starknet_block) => {
-                    let digest_starknet_block_hash = digest_starknet_block.header().hash::<H>();
-                    let storage_starknet_block_hash = storage_starknet_block.header().hash::<H>();
+                    let (digest_starknet_block_hash, storage_starknet_block_hash) = rayon::join(
+                        || digest_starknet_block.header().hash::<H>(),
+                        || storage_starknet_block.header().hash::<H>(),
+                    );
                     // Ensure the two blocks sources (chain storage and block digest) agree on the block content
                     if digest_starknet_block_hash != storage_starknet_block_hash {
                         Err(anyhow::anyhow!(
@@ -48,24 +51,25 @@ where
                         ))
                     } else {
                         let chain_id = client.runtime_api().chain_id(substrate_block_hash)?;
+                        let tx_hashes = digest_starknet_block
+                            .transactions()
+                            .par_iter()
+                            .map(|tx| {
+                                Felt252Wrapper::from(tx.compute_hash::<H>(
+                                    chain_id,
+                                    false,
+                                    Some(digest_starknet_block.header().block_number),
+                                ))
+                                .into()
+                            })
+                            .collect();
 
                         // Success, we write the Starknet to Substate hashes mapping to db
                         let mapping_commitment = mc_db::MappingCommitment {
                             block_number: digest_starknet_block.header().block_number,
                             block_hash: substrate_block_hash,
                             starknet_block_hash: digest_starknet_block_hash.into(),
-                            starknet_transaction_hashes: digest_starknet_block
-                                .transactions()
-                                .iter()
-                                .map(|tx| {
-                                    Felt252Wrapper::from(tx.compute_hash::<H>(
-                                        chain_id,
-                                        false,
-                                        Some(digest_starknet_block.header().block_number),
-                                    ))
-                                    .into()
-                                })
-                                .collect(),
+                            starknet_transaction_hashes: tx_hashes,
                         };
 
                         if let Some(block_metrics) = block_metrics {
diff --git a/crates/tui/substrate/ok.flag b/crates/tui/substrate/ok.flag
new file mode 100644
index 000000000..e69de29bb