diff --git a/modules/Gem/pom.xml b/modules/Gem/pom.xml
index 6476837..f74c4bc 100644
--- a/modules/Gem/pom.xml
+++ b/modules/Gem/pom.xml
@@ -66,6 +66,10 @@
             <id>placeholderapi</id>
             <url>https://repo.extendedclip.com/content/repositories/placeholderapi/</url>
         </repository>
+        <repository>
+            <id>helpch</id>
+            <url>https://repo.helpch.at/releases/</url>
+        </repository>
     </repositories>
 
     <dependencies>
@@ -78,7 +82,7 @@
         <dependency>
             <groupId>me.clip</groupId>
             <artifactId>placeholderapi</artifactId>
-            <version>2.11.1</version>
+            <version>2.11.5</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>
diff --git a/modules/GemShop/pom.xml b/modules/GemShop/pom.xml
index d416f07..5e5592e 100644
--- a/modules/GemShop/pom.xml
+++ b/modules/GemShop/pom.xml
@@ -72,10 +72,34 @@
         </dependency>
         <dependency>
             <groupId>com.mcatk</groupId>
-            <artifactId>gem</artifactId>
+            <artifactId>Gem</artifactId>
             <type>jar</type>
             <version>1.0.0</version>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>5.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy</artifactId>
+            <version>1.14.17</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy-agent</artifactId>
+            <version>1.14.17</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
 
diff --git a/modules/GemShop/src/main/java/com/mcatk/gemshop/shops/itemshop/ItemShop.java b/modules/GemShop/src/main/java/com/mcatk/gemshop/shops/itemshop/ItemShop.java
index 72ff5f0..803a346 100644
--- a/modules/GemShop/src/main/java/com/mcatk/gemshop/shops/itemshop/ItemShop.java
+++ b/modules/GemShop/src/main/java/com/mcatk/gemshop/shops/itemshop/ItemShop.java
@@ -5,12 +5,28 @@
 import com.mcatk.gemshop.Message;
 import org.apache.commons.lang.text.StrBuilder;
 import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.Player;
-import org.bukkit.scheduler.BukkitRunnable;
 
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.HashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
 
 public class ItemShop {
+    private final ExecutorService ioExecutor = Executors.newSingleThreadExecutor(new ThreadFactory() {
+        @Override
+        public Thread newThread(Runnable r) {
+            Thread t = new Thread(r, "GemShop-IO-Thread");
+            t.setDaemon(true);
+            return t;
+        }
+    });
+
     private HashMap<String, Items> itemsMap;
     
     public ItemShop() {
@@ -58,14 +74,40 @@ public void addItem(Player player, String shopId, String itemId, String price) {
         }
         itemsMap.get(shopId).getMap().put(itemId, item);
         GemShop.getPlugin().getConfig().set("Items." + shopId + "." + itemId, item);
-        GemShop.getPlugin().saveConfig();
+        saveConfigAsync();
         player.sendMessage(Message.INFO + "添加成功：" + itemId + " " + price + "宝石");
     }
     
     public void delItem(String shopId, String itemId) {
         itemsMap.get(shopId).getMap().remove(itemId);
         GemShop.getPlugin().getConfig().set("Items." + shopId + "." + itemId, null);
-        GemShop.getPlugin().saveConfig();
+        saveConfigAsync();
+    }
+
+    private void saveConfigAsync() {
+        if (!(GemShop.getPlugin().getConfig() instanceof YamlConfiguration)) {
+            GemShop.getPlugin().saveConfig();
+            return;
+        }
+
+        YamlConfiguration yaml = (YamlConfiguration) GemShop.getPlugin().getConfig();
+        final String data = yaml.saveToString();
+        final File file = new File(GemShop.getPlugin().getDataFolder(), "config.yml");
+
+        ioExecutor.submit(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    if (file.getParentFile() != null && !file.getParentFile().exists()) {
+                        file.getParentFile().mkdirs();
+                    }
+                    Files.write(file.toPath(), data.getBytes(StandardCharsets.UTF_8));
+                } catch (IOException e) {
+                    GemShop.getPlugin().getLogger().severe("Could not save config.yml asynchronously!");
+                    e.printStackTrace();
+                }
+            }
+        });
     }
     
     public Items getItems(String shopId) {
diff --git a/modules/GemShop/src/test/java/com/mcatk/gemshop/shops/itemshop/ItemShopBenchmarkTest.java b/modules/GemShop/src/test/java/com/mcatk/gemshop/shops/itemshop/ItemShopBenchmarkTest.java
new file mode 100644
index 0000000..2f04144
--- /dev/null
+++ b/modules/GemShop/src/test/java/com/mcatk/gemshop/shops/itemshop/ItemShopBenchmarkTest.java
@@ -0,0 +1,113 @@
+package com.mcatk.gemshop.shops.itemshop;
+
+import com.mcatk.gemshop.GemShop;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
+
+import java.io.File;
+import java.lang.reflect.Field;
+import java.util.logging.Logger;
+
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.*;
+
+public class ItemShopBenchmarkTest {
+
+    private GemShop mockPlugin;
+    private YamlConfiguration mockConfig;
+    private Player mockPlayer;
+    private PlayerInventory mockInventory;
+
+    @Before
+    public void setUp() throws Exception {
+        mockPlugin = Mockito.mock(GemShop.class);
+        mockConfig = Mockito.mock(YamlConfiguration.class);
+        mockPlayer = Mockito.mock(Player.class);
+        mockInventory = Mockito.mock(PlayerInventory.class);
+        Logger mockLogger = Mockito.mock(Logger.class);
+
+        // Inject mock plugin
+        Field pluginField = GemShop.class.getDeclaredField("plugin");
+        pluginField.setAccessible(true);
+        pluginField.set(null, mockPlugin);
+
+        when(mockPlugin.getConfig()).thenReturn(mockConfig);
+        when(mockPlugin.getLogger()).thenReturn(mockLogger);
+        // Fix NPE for new File(dataFolder, ...)
+        File tempFolder = new File(System.getProperty("java.io.tmpdir"));
+        when(mockPlugin.getDataFolder()).thenReturn(tempFolder);
+
+        when(mockPlayer.getInventory()).thenReturn(mockInventory);
+        when(mockInventory.getItemInMainHand()).thenReturn(Mockito.mock(ItemStack.class));
+
+        when(mockConfig.getConfigurationSection(anyString())).thenReturn(null);
+        when(mockConfig.saveToString()).thenReturn("key: value");
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        // Reset the static field
+        Field pluginField = GemShop.class.getDeclaredField("plugin");
+        pluginField.setAccessible(true);
+        pluginField.set(null, null);
+    }
+
+    @Test
+    public void testAddItemPerformance() {
+        // Setup slow saveConfig (which should NOT be called now)
+        doAnswer(new Answer<Void>() {
+            @Override
+            public Void answer(InvocationOnMock invocation) throws Throwable {
+                Thread.sleep(50); // Simulate 50ms Disk I/O
+                return null;
+            }
+        }).when(mockPlugin).saveConfig();
+
+        ItemShop itemShop = new ItemShop();
+
+        long startTime = System.currentTimeMillis();
+        // Price "100" as string
+        itemShop.addItem(mockPlayer, "shop1", "item1", "100");
+        long endTime = System.currentTimeMillis();
+
+        long duration = endTime - startTime;
+        System.out.println("Benchmark Execution time: " + duration + "ms");
+
+        // Assert that saveConfig was NOT called (because we use async save)
+        verify(mockPlugin, never()).saveConfig();
+
+        // Assert that saveToString WAS called
+        verify(mockConfig).saveToString();
+
+        // In optimized code, duration should be near 0ms
+        if (duration >= 50) {
+             throw new RuntimeException("Execution time too slow: " + duration + "ms. Optimization failed?");
+        }
+    }
+
+    @Test
+    public void testDelItemOptimization() {
+        // Setup initial state
+        ItemShop itemShop = new ItemShop();
+        itemShop.addItem(mockPlayer, "shop1", "item1", "100");
+
+        // Reset mocks to clear interactions from addItem
+        Mockito.clearInvocations(mockConfig, mockPlugin);
+
+        itemShop.delItem("shop1", "item1");
+
+        // Assert that saveConfig was NOT called
+        verify(mockPlugin, never()).saveConfig();
+
+        // Assert that saveToString WAS called
+        verify(mockConfig).saveToString();
+    }
+}