diff --git a/enkanetwork/cache.py b/enkanetwork/cache.py
index d1f5bf7..911f1f4 100644
--- a/enkanetwork/cache.py
+++ b/enkanetwork/cache.py
@@ -1,16 +1,17 @@
 import json
 
+from typing import Any, Dict
 from cachetools import TTLCache
 
 __all__ = ('Cache',)
 
 class Cache:
-    def __init__(self, maxsize, ttl):
+    def __init__(self, maxsize: int, ttl: int) -> None:
         self.cache = TTLCache(maxsize, ttl)
 
-    async def get(self, key):
+    async def get(self, key) -> Dict[str, Any]:
         data = self.cache.get(key)
         return json.loads(data) if data is not None else data
 
-    async def set(self, key, value):
+    async def set(self, key, value) -> None:
         self.cache[key] = json.dumps(value)
diff --git a/enkanetwork/client.py b/enkanetwork/client.py
index d5c238c..17ec3a5 100644
--- a/enkanetwork/client.py
+++ b/enkanetwork/client.py
@@ -1,6 +1,9 @@
 from __future__ import annotations
 
+import os
+import json
 import logging
+
 from .http import HTTPClient
 from .model import EnkaNetworkResponse
 from .assets import Assets
@@ -95,11 +98,18 @@ class EnkaNetworkAPI:
         print("Updating assets...")
         self.LOGGER.debug("Downloading new content...")
 
-        # get path
         path = Assets._get_path_assets()
+        for folder in path:
+            for filename in os.listdir(path[folder]):
+                self.LOGGER.debug(f"Downloading {folder} file {filename}...")
 
-        # update assets
-        await self.__http.update_asset(path)
+                data = await self.__http.update_asset(folder, filename)
+
+                self.LOGGER.debug(f"Writing {folder} file {filename}...")
+
+                # dumps to json file
+                with open(os.path.join(path[folder], filename), "w", encoding="utf-8") as f:
+                    json.dump(data["content"], f, ensure_ascii=False, indent=4)
 
         # Reload config
         self.assets.reload_assets()
diff --git a/enkanetwork/http.py b/enkanetwork/http.py
index b2f149a..87aa867 100644
--- a/enkanetwork/http.py
+++ b/enkanetwork/http.py
@@ -43,7 +43,7 @@ class Route:
             path: str,
             endpoint: str = 'enka',
             uid: Optional[str] = None,
-    ):
+    ) -> None:
         self.method = method
         self.uid = uid
         self.url = ''
@@ -59,8 +59,8 @@ class HTTPClient:
     def __init__(self, *, key: str = '', agent: str = '') -> None:
         self.__session: aiohttp.ClientSession = MISSING
         self.__headers: Dict = {}
-        self.__agent = agent
-        self.__key = key
+        self.__agent: str = agent
+        self.__key: str = key
 
     async def close(self) -> None:
         if self.__session is not MISSING:
@@ -107,7 +107,7 @@ class HTTPClient:
                         self.LOGGER.warning(f"Failure to fetch {url} ({response.status}) Retry {tries} / {RETRY_MAX}")
                         if tries > RETRY_MAX:
                             raise HTTPException(f"Failed to download {url}")
-                        await asyncio.sleep(1 + tries * 2)  # 1 + tries * 2
+                        await asyncio.sleep(1)  # 1 + tries * 2
                         continue
 
                     if response.status == 403:
@@ -139,20 +139,8 @@ class HTTPClient:
         url = f'/u/{uid}/__data.json' + ("?key={key}" if self.__key else "")
         return self.request(Route('GET', url, 'enka', uid))
 
-    async def update_asset(self, path: dict) -> NoReturn:
+    def update_asset(self, folder: str, filename: str) -> NoReturn:
+        # get new assets
+        url = f"master/exports/{folder}/{filename}"
+        return self.request(Route('GET', url, 'assets'))
 
-        self.LOGGER.debug("Downloading new content...")
-
-        for folder in path:
-            for filename in os.listdir(path[folder]):
-                self.LOGGER.debug(f"Downloading {folder} file {filename}...")
-
-                # get new assets
-                url = f"master/exports/{folder}/{filename}"
-                data = await self.request(Route('GET', url, 'assets'))
-
-                self.LOGGER.debug(f"Writing {folder} file {filename}...")
-
-                # dumps to json file
-                with open(os.path.join(path[folder], filename), "w", encoding="utf-8") as f:
-                    json.dump(data["content"], f, ensure_ascii=False, indent=4)
diff --git a/enkanetwork/model/stats.py b/enkanetwork/model/stats.py
index 9c792c8..0ba8545 100644
--- a/enkanetwork/model/stats.py
+++ b/enkanetwork/model/stats.py
@@ -17,7 +17,7 @@ class StatsPercentage(BaseModel):
     id: int = 0
     value: float = 0.0
 
-    def to_percentage(self) -> int:
+    def to_percentage(self) -> float:
         return round((round(self.value, 3) * 100), 1)
 
     def to_percentage_symbol(self) -> str:
diff --git a/enkanetwork/utils.py b/enkanetwork/utils.py
index f2f6513..c79fc03 100644
--- a/enkanetwork/utils.py
+++ b/enkanetwork/utils.py
@@ -1,9 +1,7 @@
 from __future__ import annotations
 
 import re
-import aiohttp
 import logging
-import asyncio
 import json
 import sys