diff --git a/cads_processing_api_service/config.py b/cads_processing_api_service/config.py
index 901a4fc..040c69c 100644
--- a/cads_processing_api_service/config.py
+++ b/cads_processing_api_service/config.py
@@ -17,6 +17,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import functools
 import os
 import random
 
@@ -61,6 +62,7 @@
 )
 
 
+@functools.lru_cache
 def load_download_nodes(download_nodes_file: str) -> list[str]:
     download_nodes = []
     try: