diff --git a/server-rs/crates/api-server/src/tripo3d/storage.rs b/server-rs/crates/api-server/src/tripo3d/storage.rs
index efafde061..eb4d9c823 100644
--- a/server-rs/crates/api-server/src/tripo3d/storage.rs
+++ b/server-rs/crates/api-server/src/tripo3d/storage.rs
@@ -113,7 +113,19 @@ pub(crate) async fn store_model3d_artifact(
         .ok_or_else(|| oss_unavailable("OSS 未完成环境变量配置，无法写入 3D 产物。"))?;
     let http_client = state.editor_oss_http_client();
     let content_type = resolve_artifact_content_type(content_type, slot, bytes.as_slice())?;
-    let sha256 = sha256_hex(bytes.as_slice());
+    // 模型产物上限是 512 MiB，同步哈希会把一个 Tokio worker 占住几百毫秒，拖慢同一运行时上的
+    // 其它任务。挪到 blocking 线程池，并让任务把 bytes 原样带回来，省掉一次整块复制。
+    let (sha256, bytes) = tokio::task::spawn_blocking(move || {
+        let sha256 = sha256_hex(bytes.as_slice());
+        (sha256, bytes)
+    })
+    .await
+    .map_err(|error| {
+        AppError::from_status(StatusCode::INTERNAL_SERVER_ERROR).with_details(json!({
+            "provider": TRIPO_PROVIDER,
+            "message": format!("3D 产物哈希任务失败：{error}"),
+        }))
+    })?;
     let extension = slot
         .artifact_extension(content_type.as_str())
         .ok_or_else(|| unsupported_artifact_content_type(content_type.as_str(), slot))?;