diff --git a/turbopack/crates/turbo-tasks-backend/src/backend/storage.rs b/turbopack/crates/turbo-tasks-backend/src/backend/storage.rs
index 64ad2f38b6e03d..64c389abfcafd4 100644
--- a/turbopack/crates/turbo-tasks-backend/src/backend/storage.rs
+++ b/turbopack/crates/turbo-tasks-backend/src/backend/storage.rs
@@ -337,7 +337,7 @@ where
 {
     pub fn new() -> Self {
         let shard_amount =
-            (available_parallelism().map_or(4, |v| v.get()) * 256).next_power_of_two();
+            (available_parallelism().map_or(4, |v| v.get()) * 64).next_power_of_two();
         Self {
             map: DashMap::with_capacity_and_hasher_and_shard_amount(
                 1024 * 1024,