diff --git a/api/kiwi_vpn_api/config.py b/api/kiwi_vpn_api/config.py
index 095b6c4..b90c103 100644
--- a/api/kiwi_vpn_api/config.py
+++ b/api/kiwi_vpn_api/config.py
@@ -196,15 +196,22 @@ class Config(BaseModel):
     jwt: JWTConfig = Field(default_factory=JWTConfig)
     crypto: CryptoConfig = Field(default_factory=CryptoConfig)
 
-    @staticmethod
-    def load_sync() -> Config | None:
+    __singleton: Config | None = None
+
+    @classmethod
+    @property
+    def _(cls) -> Config | None:
         """
         Load configuration from config file
         """
 
+        if cls.__singleton is not None:
+            return cls.__singleton
+
         try:
             with open(Settings.get().config_file, "r") as config_file:
-                return Config.parse_obj(json.load(config_file))
+                cls.__singleton = Config.parse_obj(json.load(config_file))
+                return cls.__singleton
 
         except FileNotFoundError:
             return None
@@ -222,7 +229,7 @@ class Config(BaseModel):
         except FileNotFoundError:
             return None
 
-    async def save(self) -> None:
+    def save(self) -> None:
         """
         Save configuration to config file
         """
diff --git a/api/kiwi_vpn_api/db/user.py b/api/kiwi_vpn_api/db/user.py
index 2e53964..f13ccc1 100644
--- a/api/kiwi_vpn_api/db/user.py
+++ b/api/kiwi_vpn_api/db/user.py
@@ -77,7 +77,7 @@ class User(UserBase, table=True):
         Authenticate with name/password against users in database.
         """
 
-        crypt_context = Config.load_sync().crypto.crypt_context_sync
+        crypt_context = Config._.crypto.crypt_context_sync
 
         if (user := cls.get(name)) is None:
             # nonexistent user, fake doing password verification
@@ -141,7 +141,7 @@ class UserCreate(UserBase):
         if (password_clear := values.get("password_clear")) is None:
             raise ValueError("No password to hash")
 
-        if (current_config := Config.load_sync()) is None:
+        if (current_config := Config._) is None:
             raise ValueError("Not configured")
 
         values["password"] = current_config.crypto.crypt_context_sync.hash(
diff --git a/api/kiwi_vpn_api/main.py b/api/kiwi_vpn_api/main.py
index 4503d1a..594d948 100755
--- a/api/kiwi_vpn_api/main.py
+++ b/api/kiwi_vpn_api/main.py
@@ -41,7 +41,7 @@ app.include_router(main_router)
 @app.on_event("startup")
 async def on_startup() -> None:
     # check if configured
-    if (current_config := await Config.load()) is not None:
+    if (current_config := Config._) is not None:
         # connect to database
         Connection.connect(current_config.db.uri)
 
diff --git a/api/kiwi_vpn_api/routers/admin.py b/api/kiwi_vpn_api/routers/admin.py
index 99dfdeb..64c7307 100644
--- a/api/kiwi_vpn_api/routers/admin.py
+++ b/api/kiwi_vpn_api/routers/admin.py
@@ -33,7 +33,7 @@ async def initial_configure(
         raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST)
 
     # create config file, connect to database
-    await config.save()
+    config.save()
     Connection.connect(current_config.db.uri)
 
 
@@ -90,5 +90,5 @@ async def set_config(
         raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST)
 
     # update config file, reconnect to database
-    await new_config.save()
+    new_config.save()
     Connection.connect(current_config.db.uri)