diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb3241e..2d1d088 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # 更新紀錄
 
+## [1.0.2] - 2026-05-25
+
+### ⚡ 效能優化
+
+- 將設定檔格式從 YAML 改為 TOML，改用 Python 內建 `tomllib` 解析，減少第三方依賴並加快啟動速度
+- 在背景執行緒預熱重量級模組（`plotly`、`folium`、`gpxpy`、`numpy`、`geopy`），縮短首次載入頁面時間
+
+---
+
 ## [1.0.0] - 2025-12-03
 
 ### 🎉 首次正式發布
diff --git a/Dockerfile b/Dockerfile
index 8d8d4fb..66fc266 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -47,5 +47,5 @@ EXPOSE 8800
 CMD ["python", "-m", "streamlit", "run", "app.py"]
 
 # Build
-# docker build --platform=linux/amd64 -t hiking_assistant:1.0.1 .
-# docker save -o hiking_assistant.tar hiking_assistant:1.0.1
\ No newline at end of file
+# docker build --platform=linux/amd64 -t hiking_assistant:1.0.2 .
+# docker save -o hiking_assistant.tar hiking_assistant:1.0.2
\ No newline at end of file
diff --git a/hiking_assistant/app.py b/hiking_assistant/app.py
index b9152a8..ab9ab48 100644
--- a/hiking_assistant/app.py
+++ b/hiking_assistant/app.py
@@ -3,26 +3,24 @@
 # author: deng
 # date: 20251127
 
+import threading
 from datetime import datetime
 
 import streamlit as st
-import yaml
-from elevation import ElevationRenderer
-from gpx import GPXProcessor
-from map import MapRenderer
-from streamlit_folium import st_folium
-from utils import convert_image_to_base64
-from weather import WeatherFetcher
+from utils import convert_image_to_base64, parse_config
+
+
+def _prewarm_imports() -> None:
+    """Pre-import heavy modules in background."""
+    import elevation  # noqa: F401 (imports plotly)
+    import gpx  # noqa: F401 (imports gpxpy, numpy, geopy)
+    import map  # noqa: F401 (imports folium)
+    import weather  # noqa: F401
 
 
 class HikingAssistant:
-    def __init__(self, config_path: str = 'assets/config.yaml') -> None:
-        self._config = self._load_config(config_path)
-
-    @staticmethod
-    def _load_config(config_path: str) -> dict:
-        with open(config_path, 'r') as f:
-            return yaml.safe_load(f)
+    def __init__(self, config_path: str = 'assets/config.toml') -> None:
+        self._config = parse_config(config_path)
 
     def _set_page_background(self, image_path: str, opacity: float = 0.8) -> None:
         """Set background image for the application.
@@ -94,6 +92,8 @@ class HikingAssistant:
                 if 'gpx_file_key' not in st.session_state or st.session_state.gpx_file_key != file_key:
                     # Process GPX file (only when it's a new file)
                     with st.spinner('正在解析 GPX 檔案...'):
+                        from gpx import GPXProcessor
+
                         gpx_processor = GPXProcessor(uploaded_file)
 
                         if not gpx_processor.validate_and_parse():
@@ -177,6 +177,9 @@ class HikingAssistant:
 
                 # Map section
                 with st.spinner('正在渲染地圖...'):
+                    from map import MapRenderer
+                    from streamlit_folium import st_folium
+
                     map_renderer = MapRenderer()
                     route_map = map_renderer.create_route_map(all_points, start_point, end_point, waypoints)
 
@@ -190,6 +193,8 @@ class HikingAssistant:
 
                 with profile_col:
                     with st.spinner('正在繪製海拔剖面圖...'):
+                        from elevation import ElevationRenderer
+
                         profile_renderer = ElevationRenderer()
                         elevation_fig = profile_renderer.create_elevation_profile(distances, elevations, gradients)
 
@@ -214,6 +219,8 @@ class HikingAssistant:
                 st.header('☀️ 天氣安抓')
 
                 if start_point:
+                    from weather import WeatherFetcher
+
                     weather_fetcher = WeatherFetcher(forecast_days=self._config['app']['weather']['forecast_days'])
                     weather_key = f'weather_{start_point[0]:.6f}_{start_point[1]:.6f}'
 
@@ -344,6 +351,12 @@ class HikingAssistant:
         st.markdown(footer_text, unsafe_allow_html=True)
 
 
+@st.cache_resource(show_spinner=False, max_entries=1)
+def get_app_instance() -> HikingAssistant:
+    return HikingAssistant()
+
+
 if __name__ == '__main__':
-    app = HikingAssistant()
+    threading.Thread(target=_prewarm_imports, daemon=True).start()
+    app = get_app_instance()
     app.run()
diff --git a/hiking_assistant/assets/config.toml b/hiking_assistant/assets/config.toml
new file mode 100644
index 0000000..e45aac1
--- /dev/null
+++ b/hiking_assistant/assets/config.toml
@@ -0,0 +1,22 @@
+[app]
+version = "1.0.2"
+page_title = "山山登山小助手"
+page_favicon_path = "./assets/new_favicon.webp"
+page_footer_text = "⚠️ 本服務提供之資訊僅供規劃參考，山區氣候瞬息萬變，請務必依據現場狀況與自身能力進行風險評估<br>Made with ❤️ by <a href=\"https://gitea.guineapig.love/deng\">deng</a>"
+page_background_path = "./assets/background_compressed.jpg"
+page_background_opacity = 0.8
+
+[app.altitude_sickness]
+elevation_threshold = 2100
+warning_text = "此路線海拔較高，請留意[高山症](https://www.ysnp.gov.tw/StaticPage/MountainSickness)發生風險"
+emoji = "💊"
+
+[app.estimated_time]
+horizontal_speed = 3
+vertical_speed = 400
+
+[app.map]
+height = 550
+
+[app.weather]
+forecast_days = 7
diff --git a/hiking_assistant/utils.py b/hiking_assistant/utils.py
index 3adceb6..233c145 100644
--- a/hiking_assistant/utils.py
+++ b/hiking_assistant/utils.py
@@ -4,6 +4,7 @@
 # date: 20251128
 
 import base64
+import tomllib
 
 import streamlit as st
 
@@ -12,3 +13,17 @@ import streamlit as st
 def convert_image_to_base64(image_path: str) -> str:
     with open(image_path, 'rb') as f:
         return base64.b64encode(f.read()).decode()
+
+
+def parse_config(config_path: str) -> dict:
+    """Config parser
+
+    Args:
+        config_path (str): path of config toml.
+
+    Returns:
+        dict: configuration dictionary
+    """
+    with open(config_path, 'rb') as file:
+        config = tomllib.load(file)
+    return config
diff --git a/pyproject.toml b/pyproject.toml
index b0daf09..6e3a983 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "hiking-assistant"
-version = "1.0.1"
+version = "1.0.2"
 description = "This is a web app to analyze gpx for hiking planning"
 readme = "README.md"
 requires-python = ">=3.13"
@@ -13,7 +13,6 @@ dependencies = [
     "requests>=2.32.3",
     "geopy>=2.4.1",
     "streamlit-plotly-events>=0.0.6",
-    "pyyaml>=6.0.3",
 ]
 
 [dependency-groups]
diff --git a/uv.lock b/uv.lock
index a266e56..779cd6b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -227,14 +227,13 @@ wheels = [
 
 [[package]]
 name = "hiking-assistant"
-version = "1.0.1"
+version = "1.0.2"
 source = { virtual = "." }
 dependencies = [
     { name = "folium" },
     { name = "geopy" },
     { name = "gpxpy" },
     { name = "plotly" },
-    { name = "pyyaml" },
     { name = "requests" },
     { name = "streamlit" },
     { name = "streamlit-folium" },
@@ -254,7 +253,6 @@ requires-dist = [
     { name = "geopy", specifier = ">=2.4.1" },
     { name = "gpxpy", specifier = ">=1.6.2" },
     { name = "plotly", specifier = ">=5.24.1" },
-    { name = "pyyaml", specifier = ">=6.0.3" },
     { name = "requests", specifier = ">=2.32.3" },
     { name = "streamlit", specifier = ">=1.51.0" },
     { name = "streamlit-folium", specifier = ">=0.23.1" },