diff --git a/src/bin/import_imdb.rs b/src/bin/import_imdb.rs
index 2096efb..f37cedf 100644
--- a/src/bin/import_imdb.rs
+++ b/src/bin/import_imdb.rs
@@ -34,7 +34,7 @@ fn main() {
 
     let cli = Cli::parse();
     let ids = rt.block_on(import_watches(&w2w_db, &cli));
-    rt.block_on(save_ids(&cli.db_path, &ids));
+    rt.block_on(save_ids(&cli.db_path, ids));
 }
 
 async fn import_watches(w2w_db: &SqlitePool, cli: &Cli) -> IdMap {
@@ -59,28 +59,38 @@ async fn import_watches(w2w_db: &SqlitePool, cli: &Cli) -> IdMap {
     map
 }
 
-async fn save_ids(path: &OsStr, ids: &IdMap) {
+async fn save_ids(path: &OsStr, ids: IdMap) {
     let path = Path::new(path);
     let file = path.file_name().unwrap();
     let file = file.to_str().unwrap();
     let path = format!("{}/w2w-{file}", path.parent().unwrap().to_str().unwrap());
 
     let conn_opts = SqliteConnectOptions::new()
+        .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal)
+        .synchronous(sqlx::sqlite::SqliteSynchronous::Normal)
         .filename(path)
-        .create_if_missing(true);
+        .create_if_missing(true)
+        .pragma("mmap_size", "3000000000");
     let mut conn = SqliteConnection::connect_with(&conn_opts).await.unwrap();
 
     let create =
         "create table if not exists id_map (imdb text not null primary key, w2w blob not null)";
     let _ = sqlx::query(create).execute(&mut conn).await.unwrap();
 
-    for (imdb, w2w) in ids.iter() {
-        sqlx::query("insert into id_map (imdb, w2w) values (?, ?)")
-            .bind(imdb)
-            .bind(w2w)
-            .execute(&mut conn)
-            .await
-            .unwrap();
+    let limit = 5000;
+    let num_ids = ids.len();
+    let mut num_rows = 0;
+    let ids = &mut ids.into_iter();
+    while num_rows < num_ids {
+        let num_rows = &mut num_rows;
+        let mut q = sqlx::QueryBuilder::new("insert into id_map (imdb, w2w) ");
+        q.push_values(ids.take(limit), |mut qb, row| {
+            qb.push_bind(row.0.clone());
+            qb.push_bind(row.1);
+            *num_rows += 1;
+        });
+        q.build().execute(&mut conn).await.unwrap();
     }
+
     conn.close().await.unwrap();
 }
diff --git a/src/db.rs b/src/db.rs
index 54d77e4..7f94e93 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -43,7 +43,8 @@ pub fn get_db_pool() -> SqlitePool {
         // be sure to have run `make` so that the libjulid extension is built
         .extension("./libjulid")
         .busy_timeout(Duration::from_secs(TIMEOUT))
-        .create_if_missing(true);
+        .create_if_missing(true)
+        .pragma("mmap_size", "3000000000");
 
     let pool = SqlitePoolOptions::new()
         .max_connections(MAX_CONNS)
diff --git a/src/imdb_utils.rs b/src/imdb_utils.rs
index 2f135b7..a959cff 100644
--- a/src/imdb_utils.rs
+++ b/src/imdb_utils.rs
@@ -82,7 +82,7 @@ pub async fn import_imdb_data(w2w_db: &SqlitePool, imdb: &SqlitePool, ids: &mut
         .await
         .unwrap();
 
-    for batch in iwatches.chunks(1_000) {
+    for batch in iwatches.chunks(2_000) {
         let mut tx = w2w_db.acquire().await.unwrap();
         let mut tx = tx.begin().await.unwrap();
         for iwatch in batch {