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 0dc7894..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:1.0.0 .
-# docker save -o hiking_assistant.tar hiking_assistant:1.0.0
\ 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 277abbb..ab9ab48 100644
--- a/hiking_assistant/app.py
+++ b/hiking_assistant/app.py
@@ -3,27 +3,26 @@
 # 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):
-        self._config = self._load_config()
+    def __init__(self, config_path: str = 'assets/config.toml') -> None:
+        self._config = parse_config(config_path)
 
-    def _load_config(self):
-        with open('assets/config.yaml', 'r') as f:
-            return yaml.safe_load(f)
-
-    def _set_page_background(self, image_path, opacity=0.8):
+    def _set_page_background(self, image_path: str, opacity: float = 0.8) -> None:
         """Set background image for the application.
 
         Args:
@@ -46,7 +45,7 @@ class HikingAssistant:
             unsafe_allow_html=True,
         )
 
-    def _add_custom_title(self, title, image_path):
+    def _add_custom_title(self, title: str, image_path: str) -> None:
         favicon_data = convert_image_to_base64(image_path)
         ext = image_path.split('.')[-1]
         st.markdown(
@@ -59,7 +58,7 @@ class HikingAssistant:
             unsafe_allow_html=True,
         )
 
-    def run(self):
+    def run(self) -> None:
         """Hiking Assistant application"""
         # Page configuration
         st.set_page_config(
@@ -93,6 +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():
@@ -176,6 +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)
 
@@ -189,6 +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)
 
@@ -213,6 +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}'
 
@@ -343,6 +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/elevation.py b/hiking_assistant/elevation.py
index 10fbfc1..02080ee 100644
--- a/hiking_assistant/elevation.py
+++ b/hiking_assistant/elevation.py
@@ -3,13 +3,15 @@
 # author: deng
 # date: 20251127
 
+from typing import Optional
+
 import plotly.graph_objects as go
 
 
 class ElevationRenderer:
     """Render elevation profiles with gradient-based coloring."""
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialize elevation profile renderer."""
         self.color = {
             'steep_ascent': 'rgb(139, 69, 19)',
@@ -32,7 +34,7 @@ class ElevationRenderer:
             'gentle_descent': '緩下坡 (> -20%)',
         }
 
-    def _get_gradient_category(self, gradient):
+    def _get_gradient_category(self, gradient: float) -> str:
         """Determine gradient category based on slope thresholds.
 
         Args:
@@ -50,7 +52,9 @@ class ElevationRenderer:
         else:
             return 'gentle_descent'
 
-    def _downsample_data(self, distances, elevations, gradients, max_points=800):
+    def _downsample_data(
+        self, distances: list[float], elevations: list[float], gradients: list[float], max_points: int = 800
+    ) -> tuple[list[float], list[float], list[float]]:
         """Downsample data if there are too many points.
 
         Args:
@@ -96,7 +100,7 @@ class ElevationRenderer:
 
         return downsampled_distances, downsampled_elevations, downsampled_gradients
 
-    def create_elevation_profile(self, distances, elevations, gradients):
+    def create_elevation_profile(self, distances: list[float], elevations: list[float], gradients: list[float]) -> Optional[go.Figure]:
         """Create an interactive elevation profile chart.
 
         Args:
@@ -184,7 +188,7 @@ class ElevationRenderer:
 
         return fig
 
-    def calculate_gradient_distribution(self, distances, gradients):
+    def calculate_gradient_distribution(self, distances: list[float], gradients: list[float]) -> Optional[dict[str, float]]:
         """Calculate distance distribution across different gradient categories.
 
         Args:
@@ -224,7 +228,7 @@ class ElevationRenderer:
             'gentle_descent': gentle_descent_km,
         }
 
-    def create_gradient_pie_chart(self, distances, gradients):
+    def create_gradient_pie_chart(self, distances: list[float], gradients: list[float]) -> Optional[go.Figure]:
         """Create a pie chart showing gradient distribution.
 
         Args:
@@ -262,7 +266,7 @@ class ElevationRenderer:
 
         return fig
 
-    def add_gradient_legend(self, fig):
+    def add_gradient_legend(self, fig: go.Figure) -> go.Figure:
         """Add a custom legend explaining the color scheme.
 
         Args:
diff --git a/hiking_assistant/gpx.py b/hiking_assistant/gpx.py
index 9e44a7e..b8b1e7d 100644
--- a/hiking_assistant/gpx.py
+++ b/hiking_assistant/gpx.py
@@ -3,6 +3,8 @@
 # author: deng
 # date: 20251127
 
+from typing import IO, Optional
+
 import gpxpy
 import numpy as np
 from geopy.distance import geodesic
@@ -11,7 +13,7 @@ from geopy.distance import geodesic
 class GPXProcessor:
     """Handle GPX file parsing and route analysis."""
 
-    def __init__(self, gpx_file):
+    def __init__(self, gpx_file: IO) -> None:
         """Initialize GPX processor with uploaded file.
 
         Args:
@@ -25,7 +27,7 @@ class GPXProcessor:
         self.distances = []  # unit: km
         self.waypoints = []  # list of (lat, lon, name, elevation)
 
-    def _get_sample_rate(self):
+    def _get_sample_rate(self) -> float:
         """Get the median time interval between points.
 
         Returns:
@@ -37,7 +39,7 @@ class GPXProcessor:
         median_sample_time = np.median(diff).total_seconds()
         return median_sample_time
 
-    def validate_and_parse(self):
+    def validate_and_parse(self) -> bool:
         """Validate and parse the GPX file.
 
         Returns:
@@ -77,7 +79,7 @@ class GPXProcessor:
         except Exception as e:
             raise Exception(f'GPX 檔案解析失敗: {str(e)}')
 
-    def calculate_distance(self):
+    def calculate_distance(self) -> float:
         """Calculate total distance of the route.
 
         Returns:
@@ -96,7 +98,7 @@ class GPXProcessor:
 
         return total_distance
 
-    def calculate_elevation_gain_loss(self, threshold=1.0):
+    def calculate_elevation_gain_loss(self, threshold: float = 1.0) -> tuple[float, float]:
         """Calculate total elevation gain and loss with noise filtering.
 
         GPS altitude data is notoriously inaccurate. Small fluctuations (noise) can
@@ -127,7 +129,7 @@ class GPXProcessor:
 
         return gain, loss
 
-    def get_min_max_elevation(self):
+    def get_min_max_elevation(self) -> tuple[float, float]:
         """Get minimum and maximum elevation.
 
         Returns:
@@ -138,7 +140,7 @@ class GPXProcessor:
 
         return min(self.elevations), max(self.elevations)
 
-    def get_start_end_points(self):
+    def get_start_end_points(self) -> tuple[Optional[tuple[float, float, float]], Optional[tuple[float, float, float]]]:
         """Get start and end point coordinates with elevation.
 
         Returns:
@@ -149,7 +151,7 @@ class GPXProcessor:
 
         return (self.points[0][0], self.points[0][1], self.elevations[0]), (self.points[-1][0], self.points[-1][1], self.elevations[-1])
 
-    def get_all_points(self):
+    def get_all_points(self) -> list[tuple[float, float]]:
         """Get all route points.
 
         Returns:
@@ -157,7 +159,7 @@ class GPXProcessor:
         """
         return self.points
 
-    def get_elevation_profile_data(self):
+    def get_elevation_profile_data(self) -> tuple[list[float], list[float]]:
         """Get data for elevation profile visualization.
 
         Returns:
@@ -165,7 +167,7 @@ class GPXProcessor:
         """
         return self.distances, self.elevations
 
-    def get_gradients(self):
+    def get_gradients(self) -> list[float]:
         """Calculate gradient (slope) for each segment.
 
         Returns:
@@ -188,7 +190,7 @@ class GPXProcessor:
 
         return gradients
 
-    def calculate_naismith_time(self, horizontal_speed=5, vertical_speed=600):
+    def calculate_naismith_time(self, horizontal_speed: float = 5, vertical_speed: float = 600) -> int:
         """Calculate estimated hiking time using Naismith's Rule.
 
         Naismith's Rule:
diff --git a/hiking_assistant/map.py b/hiking_assistant/map.py
index 01b944a..19e51ba 100644
--- a/hiking_assistant/map.py
+++ b/hiking_assistant/map.py
@@ -3,17 +3,26 @@
 # author: deng
 # date: 20251127
 
+from typing import Optional
+
 import folium
 
 
 class MapRenderer:
     """Render hiking routes on interactive maps."""
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialize map renderer."""
         pass
 
-    def create_route_map(self, points, start_point, end_point, waypoints=None, tile_layer='OpenStreetMap'):
+    def create_route_map(
+        self,
+        points: list[tuple[float, float]],
+        start_point: Optional[tuple[float, float, float]],
+        end_point: Optional[tuple[float, float, float]],
+        waypoints: Optional[list[dict]] = None,
+        tile_layer: str = 'OpenStreetMap',
+    ) -> Optional[folium.Map]:
         """Create an interactive map with the hiking route.
 
         Args:
@@ -117,7 +126,7 @@ class MapRenderer:
 
         return route_map
 
-    def add_hover_marker(self, route_map, position, label='當前位置'):
+    def add_hover_marker(self, route_map: folium.Map, position: tuple[float, float], label: str = '當前位置') -> folium.Map:
         """Add a hover position marker to the map.
 
         Args:
diff --git a/hiking_assistant/utils.py b/hiking_assistant/utils.py
index c46b20c..233c145 100644
--- a/hiking_assistant/utils.py
+++ b/hiking_assistant/utils.py
@@ -4,11 +4,26 @@
 # date: 20251128
 
 import base64
+import tomllib
 
 import streamlit as st
 
 
 @st.cache_data
-def convert_image_to_base64(image_path):
+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/hiking_assistant/weather.py b/hiking_assistant/weather.py
index aa93b1e..45b0b40 100644
--- a/hiking_assistant/weather.py
+++ b/hiking_assistant/weather.py
@@ -3,19 +3,21 @@
 # author: deng
 # date: 20251127
 
+from typing import Optional
+
 import requests
 
 
 class WeatherFetcher:
     """Fetch weather data for hiking locations."""
 
-    def __init__(self, api_url='https://api.open-meteo.com/v1/forecast', request_timeout=8, forecast_days=7):
+    def __init__(self, api_url: str = 'https://api.open-meteo.com/v1/forecast', request_timeout: int = 8, forecast_days: int = 7) -> None:
         """Initialize weather fetcher."""
         self.api_url = api_url
         self.request_timeout = request_timeout
         self.forecast_days = max(forecast_days, 1)
 
-    def convert_wind_degrees_to_flow_direction(self, degrees):
+    def convert_wind_degrees_to_flow_direction(self, degrees: Optional[float]) -> str:
         """Convert wind direction from degrees to flow direction emoji.
 
         Args:
@@ -30,7 +32,7 @@ class WeatherFetcher:
         index = round(degrees / 45) % 8
         return directions[index]
 
-    def get_wind_speed_indicator(self, wind_speed):
+    def get_wind_speed_indicator(self, wind_speed: Optional[float]) -> str:
         """Get wind speed level indicator based on speed.
 
         Args:
@@ -51,7 +53,7 @@ class WeatherFetcher:
         else:
             return '🔴'  # Dangerous
 
-    def get_uv_index_indicator(self, uv_index):
+    def get_uv_index_indicator(self, uv_index: Optional[float]) -> str:
         """Get UV index level indicator based on index.
 
         Args:
@@ -74,7 +76,7 @@ class WeatherFetcher:
         else:
             return '🟣'  # Extreme
 
-    def get_weather(self, latitude, longitude):
+    def get_weather(self, latitude: float, longitude: float) -> Optional[dict]:
         """Fetch weather data for given coordinates.
 
         Args:
diff --git a/pyproject.toml b/pyproject.toml
index 2b3cec1..6e3a983 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "hiking-assistant"
-version = "1.0.0"
+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 6ef12b5..779cd6b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -227,14 +227,13 @@ wheels = [
 
 [[package]]
 name = "hiking-assistant"
-version = "1.0.0"
+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" },