diff --git a/backend/open_webui/config.py b/backend/open_webui/config.py
index 262e7c0818..75b4b6d284 100644
--- a/backend/open_webui/config.py
+++ b/backend/open_webui/config.py
@@ -2097,6 +2097,7 @@ ENABLE_USER_WEBHOOKS = os.getenv('ENABLE_USER_WEBHOOKS', 'False').lower() == 'tr
 
 # FastAPI / AnyIO settings
 THREAD_POOL_SIZE = os.getenv('THREAD_POOL_SIZE', None)
+THREAD_POOL_THREAD_NAME_PREFIX = os.getenv('THREAD_POOL_THREAD_NAME_PREFIX', '')
 
 if THREAD_POOL_SIZE is not None and isinstance(THREAD_POOL_SIZE, str):
     try:
diff --git a/backend/open_webui/main.py b/backend/open_webui/main.py
index 9c5f538562..6cbf0155cb 100644
--- a/backend/open_webui/main.py
+++ b/backend/open_webui/main.py
@@ -7,6 +7,7 @@ import mimetypes
 import os
 import sys
 import time
+from concurrent.futures import ThreadPoolExecutor
 from contextlib import asynccontextmanager
 from uuid import uuid4
 
@@ -64,6 +65,7 @@ from open_webui.config import (
     ONEDRIVE_SHAREPOINT_URL,
     STATIC_DIR,
     THREAD_POOL_SIZE,
+    THREAD_POOL_THREAD_NAME_PREFIX,
     WEBUI_AUTH,
     WEBUI_NAME,
     async_reset_config,
@@ -343,6 +345,16 @@ async def lifespan(app: FastAPI):
     # This allows sync functions to schedule work on the main loop without blocking health checks
     app.state.main_loop = asyncio.get_running_loop()
 
+    if THREAD_POOL_SIZE and THREAD_POOL_SIZE > 0:
+        # asyncio offloads bypass AnyIO's limiter, so configure both before the first offload.
+        anyio.to_thread.current_default_thread_limiter().total_tokens = THREAD_POOL_SIZE
+        app.state.main_loop.set_default_executor(
+            ThreadPoolExecutor(
+                max_workers=THREAD_POOL_SIZE,
+                thread_name_prefix=THREAD_POOL_THREAD_NAME_PREFIX,
+            )
+        )
+
     app.state.instance_id = INSTANCE_ID
     start_logger()
 
@@ -378,10 +390,6 @@ async def lifespan(app: FastAPI):
     if app.state.redis is not None:
         app.state.redis_task_command_listener = asyncio.create_task(redis_task_command_listener(app))
 
-    if THREAD_POOL_SIZE and THREAD_POOL_SIZE > 0:
-        limiter = anyio.to_thread.current_default_thread_limiter()
-        limiter.total_tokens = THREAD_POOL_SIZE
-
     app.state.periodic_usage_pool_cleanup = asyncio.create_task(periodic_usage_pool_cleanup())
     app.state.periodic_session_pool_cleanup = asyncio.create_task(periodic_session_pool_cleanup())