diff --git a/core/src/window_service.rs b/core/src/window_service.rs
index f9d6bb14c2..1eb0b200e4 100644
--- a/core/src/window_service.rs
+++ b/core/src/window_service.rs
@@ -6,10 +6,13 @@ use crate::packet::Packets;
 use crate::repair_service::{RepairService, RepairStrategy};
 use crate::result::{Error, Result};
 use crate::streamer::PacketSender;
-use crossbeam_channel::{Receiver as CrossbeamReceiver, RecvTimeoutError};
+use crossbeam_channel::{
+    unbounded, Receiver as CrossbeamReceiver, RecvTimeoutError, Sender as CrossbeamSender,
+};
 use rayon::iter::IntoParallelRefMutIterator;
 use rayon::iter::ParallelIterator;
 use rayon::ThreadPool;
+use solana_ledger::bank_forks::BankForks;
 use solana_ledger::blocktree::{self, Blocktree};
 use solana_ledger::leader_schedule_cache::LeaderScheduleCache;
 use solana_ledger::shred::Shred;
@@ -67,14 +70,33 @@ pub fn should_retransmit_and_persist(
     }
 }
 
+fn run_insert(
+    shred_receiver: &CrossbeamReceiver<Vec<Shred>>,
+    blocktree: &Arc<Blocktree>,
+    leader_schedule_cache: &Arc<LeaderScheduleCache>,
+) -> Result<()> {
+    let timer = Duration::from_millis(200);
+    let mut shreds = shred_receiver.recv_timeout(timer)?;
+
+    while let Ok(mut more_shreds) = shred_receiver.try_recv() {
+        shreds.append(&mut more_shreds)
+    }
+
+    let blocktree_insert_metrics =
+        blocktree.insert_shreds(shreds, Some(leader_schedule_cache), false)?;
+    blocktree_insert_metrics.report_metrics("recv-window-insert-shreds");
+
+    Ok(())
+}
+
 fn recv_window<F>(
     blocktree: &Arc<Blocktree>,
+    insert_shred_sender: &CrossbeamSender<Vec<Shred>>,
     my_pubkey: &Pubkey,
     verified_receiver: &CrossbeamReceiver<Vec<Packets>>,
     retransmit: &PacketSender,
     shred_filter: F,
     thread_pool: &ThreadPool,
-    leader_schedule_cache: &Arc<LeaderScheduleCache>,
 ) -> Result<()>
 where
     F: Fn(&Shred, u64) -> bool + Sync,
@@ -136,9 +158,7 @@ where
         }
     }
 
-    let blocktree_insert_metrics =
-        blocktree.insert_shreds(shreds, Some(leader_schedule_cache), false)?;
-    blocktree_insert_metrics.report_metrics("recv-window-insert-shreds");
+    insert_shred_sender.send(shreds)?;
 
     trace!(
         "Elapsed processing time in recv_window(): {}",
@@ -168,6 +188,7 @@ impl Drop for Finalizer {
 
 pub struct WindowService {
     t_window: JoinHandle<()>,
+    t_insert: JoinHandle<()>,
     repair_service: RepairService,
 }
 
@@ -192,7 +213,6 @@ impl WindowService {
     {
         let bank_forks = match repair_strategy {
             RepairStrategy::RepairRange(_) => None,
-
             RepairStrategy::RepairAll { ref bank_forks, .. } => Some(bank_forks.clone()),
         };
 
@@ -203,28 +223,109 @@ impl WindowService {
             cluster_info.clone(),
             repair_strategy,
         );
+
+        let (insert_sender, insert_receiver) = unbounded();
+
+        let t_insert = Self::start_window_insert_thread(
+            exit,
+            &blocktree,
+            leader_schedule_cache,
+            insert_receiver,
+        );
+
+        let t_window = Self::start_recv_window_thread(
+            cluster_info.read().unwrap().id(),
+            exit,
+            &blocktree,
+            insert_sender,
+            verified_receiver,
+            shred_filter,
+            bank_forks,
+            retransmit,
+        );
+
+        WindowService {
+            t_window,
+            t_insert,
+            repair_service,
+        }
+    }
+
+    fn start_window_insert_thread(
+        exit: &Arc<AtomicBool>,
+        blocktree: &Arc<Blocktree>,
+        leader_schedule_cache: &Arc<LeaderScheduleCache>,
+        insert_receiver: CrossbeamReceiver<Vec<Shred>>,
+    ) -> JoinHandle<()> {
         let exit = exit.clone();
-        let shred_filter = Arc::new(shred_filter);
-        let bank_forks = bank_forks.clone();
+        let blocktree = blocktree.clone();
         let leader_schedule_cache = leader_schedule_cache.clone();
-        let t_window = Builder::new()
+        let mut handle_timeout = || {};
+        let handle_error = || {
+            inc_new_counter_error!("solana-window-insert-error", 1, 1);
+        };
+        Builder::new()
+            .name("solana-window-insert".to_string())
+            .spawn(move || loop {
+                if exit.load(Ordering::Relaxed) {
+                    break;
+                }
+
+                if let Err(e) = run_insert(&insert_receiver, &blocktree, &leader_schedule_cache) {
+                    if Self::should_exit_on_error(e, &mut handle_timeout, &handle_error) {
+                        break;
+                    }
+                }
+            })
+            .unwrap()
+    }
+
+    fn start_recv_window_thread<F>(
+        id: Pubkey,
+        exit: &Arc<AtomicBool>,
+        blocktree: &Arc<Blocktree>,
+        insert_sender: CrossbeamSender<Vec<Shred>>,
+        verified_receiver: CrossbeamReceiver<Vec<Packets>>,
+        shred_filter: F,
+        bank_forks: Option<Arc<RwLock<BankForks>>>,
+        retransmit: PacketSender,
+    ) -> JoinHandle<()>
+    where
+        F: 'static
+            + Fn(&Pubkey, &Shred, Option<Arc<Bank>>, u64) -> bool
+            + std::marker::Send
+            + std::marker::Sync,
+    {
+        let exit = exit.clone();
+        let blocktree = blocktree.clone();
+        Builder::new()
             .name("solana-window".to_string())
             .spawn(move || {
                 let _exit = Finalizer::new(exit.clone());
-                let id = cluster_info.read().unwrap().id();
                 trace!("{}: RECV_WINDOW started", id);
-                let mut now = Instant::now();
                 let thread_pool = rayon::ThreadPoolBuilder::new()
                     .num_threads(get_thread_count())
                     .build()
                     .unwrap();
+                let mut now = Instant::now();
+                let handle_error = || {
+                    inc_new_counter_error!("solana-window-error", 1, 1);
+                };
+
                 loop {
                     if exit.load(Ordering::Relaxed) {
                         break;
                     }
 
+                    let mut handle_timeout = || {
+                        if now.elapsed() > Duration::from_secs(30) {
+                            warn!("Window does not seem to be receiving data. Ensure port configuration is correct...");
+                            now = Instant::now();
+                        }
+                    };
                     if let Err(e) = recv_window(
                         &blocktree,
+                        &insert_sender,
                         &id,
                         &verified_receiver,
                         &retransmit,
@@ -239,36 +340,40 @@ impl WindowService {
                             )
                         },
                         &thread_pool,
-                        &leader_schedule_cache,
                     ) {
-                        match e {
-                            Error::CrossbeamRecvTimeoutError(RecvTimeoutError::Disconnected) => break,
-                            Error::CrossbeamRecvTimeoutError(RecvTimeoutError::Timeout) => {
-                                if now.elapsed() > Duration::from_secs(30) {
-                                    warn!("Window does not seem to be receiving data. Ensure port configuration is correct...");
-                                    now = Instant::now();
-                                }
-                            }
-                            _ => {
-                                inc_new_counter_error!("streamer-window-error", 1, 1);
-                                error!("window error: {:?}", e);
-                            }
+                        if Self::should_exit_on_error(e, &mut handle_timeout, &handle_error) {
+                            break;
                         }
                     } else {
                         now = Instant::now();
                     }
                 }
             })
-            .unwrap();
+            .unwrap()
+    }
 
-        WindowService {
-            t_window,
-            repair_service,
+    fn should_exit_on_error<F, H>(e: Error, handle_timeout: &mut F, handle_error: &H) -> bool
+    where
+        F: FnMut() -> (),
+        H: Fn() -> (),
+    {
+        match e {
+            Error::CrossbeamRecvTimeoutError(RecvTimeoutError::Disconnected) => true,
+            Error::CrossbeamRecvTimeoutError(RecvTimeoutError::Timeout) => {
+                handle_timeout();
+                false
+            }
+            _ => {
+                handle_error();
+                error!("thread {:?} error {:?}", thread::current().name(), e);
+                false
+            }
         }
     }
 
     pub fn join(self) -> thread::Result<()> {
         self.t_window.join()?;
+        self.t_insert.join()?;
         self.repair_service.join()
     }
 }
@@ -283,7 +388,6 @@ mod test {
         packet::{Packet, Packets},
         repair_service::RepairSlotRange,
     };
-    use crossbeam_channel::unbounded;
     use rand::thread_rng;
     use solana_ledger::shred::DataShredHeader;
     use solana_ledger::{