diff --git a/brevia/index.py b/brevia/index.py
index 6ec4ceb..43c9af7 100644
--- a/brevia/index.py
+++ b/brevia/index.py
@@ -1,6 +1,8 @@
 """Index document with embeddings in vector database."""
+from functools import lru_cache
 from os import path
 from logging import getLogger
+from warnings import warn
 from langchain_community.vectorstores.pgembedding import CollectionStore
 from langchain_community.vectorstores.pgembedding import EmbeddingStore
 from langchain_community.vectorstores.pgvector import PGVector
@@ -19,9 +21,16 @@
 
 def init_index():
     """Init index data"""
+    warn("init_index deprecated, use init_splitting_data instead", DeprecationWarning)
+    init_splitting_data()
+
+
+@lru_cache
+def init_splitting_data() -> bool:
+    """Init splitting tools data (NLTK for now)"""
     try:
         import nltk  # pylint: disable=import-outside-toplevel
-        nltk.download('punkt')
+        return nltk.download('punkt')
 
     except ImportError as exc:
         raise ImportError(
@@ -92,6 +101,7 @@ def split_document(
     document: Document, collection_meta: dict = {}
 ) -> list[Document]:
     """ Split document into text chunks and return a list of documents"""
+    init_splitting_data()
     text_splitter = create_splitter(collection_meta)
     texts = text_splitter.split_documents([document])
     counter = 1
diff --git a/brevia/routers/app_routers.py b/brevia/routers/app_routers.py
index 56a6da5..931b65a 100644
--- a/brevia/routers/app_routers.py
+++ b/brevia/routers/app_routers.py
@@ -1,6 +1,5 @@
 """Add brevia app routers."""
 from fastapi import FastAPI
-from brevia import index
 from brevia.routers import (
     analyze_router,
     index_router,
@@ -25,5 +24,3 @@ def add_routers(app: FastAPI) -> None:
     app.include_router(qa_router.router)
     app.include_router(status_router.router)
     app.include_router(completion_router.router)
-
-    index.init_index()
diff --git a/tests/conftest.py b/tests/conftest.py
index 006ddef..1079f0e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,13 +4,13 @@
 from alembic import command
 from alembic.config import Config
 from dotenv import dotenv_values
-from brevia.index import init_index
+from brevia.index import init_splitting_data
 from brevia.settings import get_settings
 
 
 def pytest_sessionstart(session):
     """Init index data, just once"""
-    return init_index()
+    return init_splitting_data()
 
 
 def update_settings():