diff --git a/README.md b/README.md
index cb715fd..e032c3d 100644
--- a/README.md
+++ b/README.md
@@ -613,10 +613,17 @@ There's a few required configuration options for object storage. I will try to e
 - secret-key: this is a second secret your cloud provider will give to you in order to access the
     bucket
 
+Additionally, there's a commandline argument that can be set to change the default level of
+concurrency for the migration. pict-rs will attempt to migrate 32 hashes at a time, but for large
+deployments, it may be worth trying to increase this value. Setting it to 128, 256, or even 512
+could be useful. Note that the bigger this value, the more concurrent connections to the object
+storage provider will be made.
+
 The command will look something like this:
 ```bash
 $ pict-rs \
     migrate-store \
+        --concurrency 32 \
     filesystem \
         -p /path/to/files \
     object-storage \
diff --git a/src/config/commandline.rs b/src/config/commandline.rs
index bc48b4d..2362e9a 100644
--- a/src/config/commandline.rs
+++ b/src/config/commandline.rs
@@ -156,6 +156,7 @@ impl Args {
             }
             Command::MigrateStore(MigrateStore {
                 skip_missing_files,
+                concurrency,
                 store,
             }) => {
                 let server = Server::default();
@@ -174,6 +175,7 @@ impl Args {
                             },
                             operation: Operation::MigrateStore {
                                 skip_missing_files,
+                                concurrency,
                                 from: from.into(),
                                 to: to.into(),
                             },
@@ -192,6 +194,7 @@ impl Args {
                                 },
                                 operation: Operation::MigrateStore {
                                     skip_missing_files,
+                                    concurrency,
                                     from: from.into(),
                                     to: to.into(),
                                 },
@@ -214,6 +217,7 @@ impl Args {
                                     },
                                     operation: Operation::MigrateStore {
                                         skip_missing_files,
+                                        concurrency,
                                         from: from.into(),
                                         to: to.into(),
                                     },
@@ -235,6 +239,7 @@ impl Args {
                                 },
                                 operation: Operation::MigrateStore {
                                     skip_missing_files,
+                                    concurrency,
                                     from: from.into(),
                                     to: to.into(),
                                 },
@@ -262,6 +267,7 @@ pub(crate) enum Operation {
     Run,
     MigrateStore {
         skip_missing_files: bool,
+        concurrency: usize,
         from: crate::config::primitives::Store,
         to: crate::config::primitives::Store,
     },
@@ -571,6 +577,12 @@ struct MigrateStore {
     #[arg(long)]
     skip_missing_files: bool,
 
+    /// How many hashes pict-rs should attempt to migrate at the same time. This does not
+    /// correspond to a thread count, but instead how many in-flight migrations can happen.
+    /// Increasing this number may improve throughput
+    #[arg(long, default_value = "32")]
+    concurrency: usize,
+
     #[command(subcommand)]
     store: MigrateStoreFrom,
 }
diff --git a/src/lib.rs b/src/lib.rs
index 2d6d57a..f0cfbb2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1327,6 +1327,7 @@ async fn migrate_inner<S1>(
     from: S1,
     to: config::primitives::Store,
     skip_missing_files: bool,
+    concurrency: usize,
 ) -> color_eyre::Result<()>
 where
     S1: Store + 'static,
@@ -1336,7 +1337,9 @@ where
             let to = FileStore::build(path.clone(), repo.clone()).await?;
 
             match repo {
-                Repo::Sled(repo) => migrate_store(repo, from, to, skip_missing_files).await?,
+                Repo::Sled(repo) => {
+                    migrate_store(repo, from, to, skip_missing_files, concurrency).await?
+                }
             }
         }
         config::primitives::Store::ObjectStorage(config::primitives::ObjectStorage {
@@ -1370,7 +1373,9 @@ where
             .build(client);
 
             match repo {
-                Repo::Sled(repo) => migrate_store(repo, from, to, skip_missing_files).await?,
+                Repo::Sled(repo) => {
+                    migrate_store(repo, from, to, skip_missing_files, concurrency).await?
+                }
             }
         }
     }
@@ -1457,13 +1462,14 @@ pub async fn run() -> color_eyre::Result<()> {
         Operation::Run => (),
         Operation::MigrateStore {
             skip_missing_files,
+            concurrency,
             from,
             to,
         } => {
             match from {
                 config::primitives::Store::Filesystem(config::Filesystem { path }) => {
                     let from = FileStore::build(path.clone(), repo.clone()).await?;
-                    migrate_inner(repo, client, from, to, skip_missing_files).await?;
+                    migrate_inner(repo, client, from, to, skip_missing_files, concurrency).await?;
                 }
                 config::primitives::Store::ObjectStorage(config::primitives::ObjectStorage {
                     endpoint,
@@ -1495,7 +1501,7 @@ pub async fn run() -> color_eyre::Result<()> {
                     .await?
                     .build(client.clone());
 
-                    migrate_inner(repo, client, from, to, skip_missing_files).await?;
+                    migrate_inner(repo, client, from, to, skip_missing_files, concurrency).await?;
                 }
             }
 
diff --git a/src/migrate_store.rs b/src/migrate_store.rs
index 247acc4..f5df753 100644
--- a/src/migrate_store.rs
+++ b/src/migrate_store.rs
@@ -16,6 +16,7 @@ pub(super) async fn migrate_store<R, S1, S2>(
     from: S1,
     to: S2,
     skip_missing_files: bool,
+    concurrency: usize,
 ) -> Result<(), Error>
 where
     S1: Store + Clone + 'static,
@@ -37,8 +38,14 @@ where
 
     let mut failure_count = 0;
 
-    while let Err(e) =
-        do_migrate_store(repo.clone(), from.clone(), to.clone(), skip_missing_files).await
+    while let Err(e) = do_migrate_store(
+        repo.clone(),
+        from.clone(),
+        to.clone(),
+        skip_missing_files,
+        concurrency,
+    )
+    .await
     {
         tracing::error!("Migration failed with {}", format!("{e:?}"));
 
@@ -75,6 +82,7 @@ async fn do_migrate_store<R, S1, S2>(
     from: S1,
     to: S2,
     skip_missing_files: bool,
+    concurrency: usize,
 ) -> Result<(), Error>
 where
     S1: Store + 'static,
@@ -116,7 +124,7 @@ where
     while let Some(hash) = stream.next().await {
         let hash = hash?.as_ref().to_vec();
 
-        if joinset.len() >= 32 {
+        if joinset.len() >= concurrency {
             if let Some(res) = joinset.join_next().await {
                 res.map_err(|_| UploadError::Canceled)??;
             }