diff --git a/docker-compose.yml b/docker-compose.yml
index e2abe3d..21aa968 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -142,6 +142,7 @@ services:
       - ./backend:/app
       - uploads:/app/uploads
       - /opt/blender:/opt/blender:ro
+      - optix-cache:/root/.nv          # persist OptiX BVH/kernel cache across rebuilds
     depends_on:
       postgres:
         condition: service_healthy
@@ -200,3 +201,4 @@ volumes:
   pgdata:
   uploads:
   minio-data:
+  optix-cache:     # OptiX BVH/kernel pipeline cache (survives render-worker rebuilds)