diff --git a/runtime/src/accounts_db.rs b/runtime/src/accounts_db.rs
index adef621aa..2bb0f5114 100644
--- a/runtime/src/accounts_db.rs
+++ b/runtime/src/accounts_db.rs
@@ -2424,6 +2424,7 @@ impl AccountsDb {
     fn construct_candidate_clean_keys(
         &self,
         max_clean_root: Option<Slot>,
+        is_startup: bool,
         last_full_snapshot_slot: Option<Slot>,
         timings: &mut CleanKeyTimings,
     ) -> Vec<Pubkey> {
@@ -2441,11 +2442,33 @@ impl AccountsDb {
         });
         let dirty_stores_len = dirty_stores.len();
         let pubkeys = DashSet::new();
-        timings.oldest_dirty_slot = max_slot_inclusive.saturating_add(1);
-        for (slot, store) in dirty_stores {
-            timings.oldest_dirty_slot = std::cmp::min(timings.oldest_dirty_slot, slot);
-            store.accounts.account_iter().for_each(|account| {
-                pubkeys.insert(account.meta.pubkey);
+        let mut dirty_store_routine = || {
+            let chunk_size = 1.max(dirty_stores_len.saturating_div(rayon::current_num_threads()));
+            let oldest_dirty_slots: Vec<u64> = dirty_stores
+                .par_chunks(chunk_size)
+                .map(|dirty_store_chunk| {
+                    let mut oldest_dirty_slot = max_slot_inclusive.saturating_add(1);
+                    dirty_store_chunk.iter().for_each(|(slot, store)| {
+                        oldest_dirty_slot = oldest_dirty_slot.min(*slot);
+                        store.accounts.account_iter().for_each(|account| {
+                            pubkeys.insert(account.meta.pubkey);
+                        });
+                    });
+                    oldest_dirty_slot
+                })
+                .collect();
+            timings.oldest_dirty_slot = *oldest_dirty_slots
+                .iter()
+                .min()
+                .unwrap_or(&max_slot_inclusive.saturating_add(1));
+        };
+
+        if is_startup {
+            // Free to consume all the cores during startup
+            dirty_store_routine();
+        } else {
+            self.thread_pool_clean.install(|| {
+                dirty_store_routine();
             });
         }
         trace!(
@@ -2533,6 +2556,7 @@ impl AccountsDb {
         let mut key_timings = CleanKeyTimings::default();
         let mut pubkeys = self.construct_candidate_clean_keys(
             max_clean_root,
+            is_startup,
             last_full_snapshot_slot,
             &mut key_timings,
         );