diff --git a/benchmarks/di_nested.py b/benchmarks/di_nested.py
index 010fa95d..4b6da670 100644
--- a/benchmarks/di_nested.py
+++ b/benchmarks/di_nested.py
@@ -10,7 +10,7 @@
 from di import Depends
 from docs.src.starlette.src import App
 
-root = generate_dag(Depends, 15, 5, 3)
+root = generate_dag(Depends, 4, 3, 3)
 
 
 app = App()
diff --git a/benchmarks/fastapi_nested.py b/benchmarks/fastapi_nested.py
index febaedc6..786248ba 100644
--- a/benchmarks/fastapi_nested.py
+++ b/benchmarks/fastapi_nested.py
@@ -11,7 +11,7 @@
 
 from benchmarks.utils import generate_dag
 
-root = generate_dag(Depends, 15, 5, 3)
+root = generate_dag(Depends, 4, 3, 3)
 
 
 app = App()
@@ -24,6 +24,6 @@ async def endpoint(dag: None = Depends(root)):
 
 with TestClient(app) as client:
     start = time.time()
-    for _ in range(2):
+    for _ in range(50):
         client.get("/")
     print(f"{time.time()-start}")
diff --git a/benchmarks/solve.py b/benchmarks/solve.py
new file mode 100644
index 00000000..9ffc49db
--- /dev/null
+++ b/benchmarks/solve.py
@@ -0,0 +1,37 @@
+"""Profile solving a DAG
+"""
+
+import cProfile
+import pstats
+
+from benchmarks.utils import generate_dag
+from di import Container, Dependant, Depends
+
+root = generate_dag(Depends, 1, 1, 1)
+
+
+async def endpoint(dag: None = Depends(root)):
+    return ...
+
+
+container = Container()
+solved = container.solve(Dependant(endpoint))
+
+
+async def bench():
+    await container.execute_async(solved)
+
+
+async def main():
+    profiler = cProfile.Profile()
+    profiler.enable()
+    await bench()
+    profiler.disable()
+    stats = pstats.Stats(profiler)
+    stats.dump_stats(filename="bench.prof")
+
+
+if __name__ == "__main__":
+    import asyncio
+
+    asyncio.run(main())
diff --git a/di/_local_scope_context.py b/di/_local_scope_context.py
index 03804859..bbddbc4f 100644
--- a/di/_local_scope_context.py
+++ b/di/_local_scope_context.py
@@ -12,12 +12,16 @@
 
 
 class LocalScopeContext(FusedContextManager[None]):
+    context: contextvars.ContextVar[ContainerState]
+    scope: Scope
+    token: Optional[contextvars.Token[ContainerState]]
+
     def __init__(
         self, context: contextvars.ContextVar[ContainerState], scope: Scope
     ) -> None:
         self.context = context
         self.scope = scope
-        self.token: Optional[contextvars.Token[ContainerState]] = None
+        self.token = None
 
     def __enter__(self):
         current = self.context.get()
diff --git a/di/_scope_map.py b/di/_scope_map.py
index ba6345ed..c95b8563 100644
--- a/di/_scope_map.py
+++ b/di/_scope_map.py
@@ -26,10 +26,12 @@ class ScopeMap(Generic[KT, VT]):
     ChainMap also doesn't allow you to set values anywhere but the left mapping, and we need to set values in arbitrary mappings.
     """
 
+    mappings: Dict[Scope, Dict[KT, VT]]
+
     __slots__ = ("mappings",)
 
     def __init__(self) -> None:
-        self.mappings: Dict[Scope, Dict[KT, VT]] = {}
+        self.mappings = {}
 
     def get(self, key: KT) -> VT:
         for mapping in self.mappings.values():
@@ -68,7 +70,7 @@ def pop_scope(self, scope: Scope) -> None:
         self.mappings.pop(scope)
 
     def copy(self) -> ScopeMap[KT, VT]:
-        new = ScopeMap[KT, VT]()
+        new = type(self)()
         new.mappings = self.mappings.copy()
         return new
 
diff --git a/di/_state.py b/di/_state.py
index b4e9d0ec..91f18db0 100644
--- a/di/_state.py
+++ b/di/_state.py
@@ -27,13 +27,14 @@
 
 
 class ContainerState(object):
-
-    __slots__ = ("binds", "cached_values", "stacks")
+    binds: Dict[DependencyProvider, DependantProtocol[Any]]
+    cached_values: ScopeMap[DependencyProvider, Any]
+    stacks: Dict[Scope, Union[AsyncExitStack, ExitStack]]
 
     def __init__(self) -> None:
-        self.binds: Dict[DependencyProvider, DependantProtocol[Any]] = {}
-        self.cached_values = ScopeMap[DependencyProvider, Any]()
-        self.stacks: Dict[Scope, Union[AsyncExitStack, ExitStack]] = {}
+        self.binds = {}
+        self.cached_values = ScopeMap()
+        self.stacks = {}
 
     def copy(self) -> "ContainerState":
         new = ContainerState()
diff --git a/pyproject.toml b/pyproject.toml
index e858883d..e62eb755 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "di"
-version = "0.4.14"
+version = "0.4.15"
 description = "Autowiring dependency injection"
 authors = ["Adrian Garcia Badaracco <adrian@adriangb.com>"]
 readme = "README.md"