diff --git a/fastapi/_compat.py b/fastapi/_compat.py
index 227ad837d..9c1b37185 100644
--- a/fastapi/_compat.py
+++ b/fastapi/_compat.py
@@ -200,7 +200,7 @@ if PYDANTIC_V2:
         # This expects that GenerateJsonSchema was already used to generate the definitions
         json_schema = field_mapping[(field, override_mode or field.mode)]
         if "$ref" not in json_schema:
-            # TODO remove when deprecating Pydantic v1
+            # Set title for field when not using reference
             # Ref: https://github.com/pydantic/pydantic/blob/d61792cc42c80b13b23e3ffa74bc37ec7c77f7d1/pydantic/schema.py#L207
             json_schema["title"] = (
                 field.field_info.title or field.alias.title().replace("_", " ")
diff --git a/fastapi/openapi/utils.py b/fastapi/openapi/utils.py
index 808646cc2..86a7bff7a 100644
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@@ -338,16 +338,22 @@ def get_openapi_path(
             if route.status_code is not None:
                 status_code = str(route.status_code)
             else:
-                # It would probably make more sense for all response classes to have an
-                # explicit default status_code, and to extract it from them, instead of
-                # doing this inspection tricks, that would probably be in the future
-                # TODO: probably make status_code a default class attribute for all
-                # responses in Starlette
-                response_signature = inspect.signature(current_response_class.__init__)
-                status_code_param = response_signature.parameters.get("status_code")
-                if status_code_param is not None:
-                    if isinstance(status_code_param.default, int):
-                        status_code = str(status_code_param.default)
+                # Use cached attribute if available, otherwise fall back to inspection
+                # This improves performance by avoiding repeated signature inspection
+                if hasattr(current_response_class, "default_status_code"):
+                    status_code = str(current_response_class.default_status_code)
+                else:
+                    response_signature = inspect.signature(
+                        current_response_class.__init__
+                    )
+                    status_code_param = response_signature.parameters.get("status_code")
+                    if status_code_param is not None:
+                        if isinstance(status_code_param.default, int):
+                            status_code = str(status_code_param.default)
+                        else:
+                            status_code = "200"
+                    else:
+                        status_code = "200"
             operation.setdefault("responses", {}).setdefault(status_code, {})[
                 "description"
             ] = route.response_description
diff --git a/fastapi/routing.py b/fastapi/routing.py
index 54c75a027..18d22b3a3 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -365,10 +365,6 @@ def get_websocket_app(
 ) -> Callable[[WebSocket], Coroutine[Any, Any, Any]]:
     async def app(websocket: WebSocket) -> None:
         async with AsyncExitStack() as async_exit_stack:
-            # TODO: remove this scope later, after a few releases
-            # This scope fastapi_astack is no longer used by FastAPI, kept for
-            # compatibility, just in case
-            websocket.scope["fastapi_astack"] = async_exit_stack
             solved_result = await solve_dependencies(
                 request=websocket,
                 dependant=dependant,
@@ -521,7 +517,6 @@ class APIRoute(routing.Route):
             # would pass the validation and be returned as is.
             # By being a new field, no inheritance will be passed as is. A new model
             # will always be created.
-            # TODO: remove when deprecating Pydantic v1
             self.secure_cloned_response_field: Optional[ModelField] = (
                 create_cloned_field(self.response_field)
             )