diff --git a/src/controller.rs b/src/controller.rs
index 2a05a91..6336ac7 100644
--- a/src/controller.rs
+++ b/src/controller.rs
@@ -1,14 +1,11 @@
-use std::ops::Sub;
-use std::time::{Duration, SystemTime};
+use std::time::Duration;
 
-use chrono::{DateTime, Utc};
 use eyre::WrapErr;
 use futures_ticker::Ticker;
 use futures_util::StreamExt;
-use libp2p::PeerId;
 use sqlx::SqlitePool;
 use tokio::select;
-use tokio::sync::{mpsc, oneshot};
+use tokio::sync::{mpsc, oneshot, Semaphore};
 
 use crate::chain::inclusion_claim_correct;
 use crate::config::{ChainInclusionMode, Config};
@@ -129,13 +126,13 @@ impl Controller {
                     self.handle_event(event).await;
                 }
                 _ = self.sync_ticker.next() => {
-                    self.do_sync().await;
+                    self.request_sync().await;
                 }
             }
         }
     }
 
-    async fn do_sync(&self) {
+    async fn request_sync(&self) {
         let from = Some(
             chrono::Utc::now() - Duration::from_secs(60 * 60 * self.config.sync_lookback_hours),
         );
@@ -176,9 +173,13 @@ impl Controller {
                 tracing::info!(histogram.sync_request_processed = 1);
             }
             P2PEvent::SyncResponse { premints } => {
-                for premint in premints {
-                    let _ = self.validate_and_insert(premint).await;
-                }
+                let sem = Semaphore::new(10);
+                futures_util::future::join_all(premints.into_iter().map(|p| async {
+                    let permit = sem.acquire().await.unwrap();
+                    let _ = self.validate_and_insert(p).await;
+                    drop(permit);
+                }))
+                .await;
             }
         }
     }
@@ -269,7 +270,7 @@ impl Controller {
                 }
             }
             ControllerCommands::Sync => {
-                self.do_sync().await;
+                self.request_sync().await;
             }
         }
         Ok(())