diff --git a/modules/AcShop/pom.xml b/modules/AcShop/pom.xml
index b929296..1b86d4e 100644
--- a/modules/AcShop/pom.xml
+++ b/modules/AcShop/pom.xml
@@ -86,6 +86,18 @@
             <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-core</artifactId>
+            <version>5.11.0</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
 </project>
diff --git a/modules/AcShop/src/main/java/com/mcatk/acshop/FileOperation.java b/modules/AcShop/src/main/java/com/mcatk/acshop/FileOperation.java
index 5bc8638..8bb3931 100644
--- a/modules/AcShop/src/main/java/com/mcatk/acshop/FileOperation.java
+++ b/modules/AcShop/src/main/java/com/mcatk/acshop/FileOperation.java
@@ -11,23 +11,35 @@
 
 public class FileOperation {
     
+    private static final Gson gson = new GsonBuilder().setPrettyPrinting().create();
     private final File shopsFile;
-    private final Gson gson;
     
     public FileOperation() {
-        shopsFile = new File(AcShop.getPlugin().getDataFolder(), "shopsFile.json");
-        gson = new GsonBuilder().setPrettyPrinting().create();
+        this(AcShop.getPlugin().getDataFolder());
+    }
+
+    public FileOperation(File dataFolder) {
+        this.shopsFile = new File(dataFolder, "shopsFile.json");
     }
     
     public void saveShops(Shops shops) {
-        try {
-            FileWriter writer = new FileWriter(shopsFile);
+        try (FileWriter writer = new FileWriter(shopsFile)) {
             gson.toJson(shops, writer);
-            writer.flush();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
+
+    public void saveShopsAsync(Shops shops) {
+        final String json = gson.toJson(shops);
+        org.bukkit.Bukkit.getScheduler().runTaskAsynchronously(AcShop.getPlugin(), () -> {
+            try (FileWriter writer = new FileWriter(shopsFile)) {
+                writer.write(json);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+    }
     
     public Shops loadShops() {
         Shops shops = null;
diff --git a/modules/AcShop/src/main/java/com/mcatk/acshop/command/AdminCommand.java b/modules/AcShop/src/main/java/com/mcatk/acshop/command/AdminCommand.java
index ee8c7e1..1b1d97d 100644
--- a/modules/AcShop/src/main/java/com/mcatk/acshop/command/AdminCommand.java
+++ b/modules/AcShop/src/main/java/com/mcatk/acshop/command/AdminCommand.java
@@ -47,7 +47,7 @@ public boolean onCommand(CommandSender sender, Command command, String label, St
                 break;
             default:
         }
-        new FileOperation().saveShops(AcShop.getShops());
+        new FileOperation().saveShopsAsync(AcShop.getShops());
         return true;
     }
     
diff --git a/modules/AcShop/src/test/java/com/mcatk/acshop/BenchmarkTest.java b/modules/AcShop/src/test/java/com/mcatk/acshop/BenchmarkTest.java
new file mode 100644
index 0000000..3390eab
--- /dev/null
+++ b/modules/AcShop/src/test/java/com/mcatk/acshop/BenchmarkTest.java
@@ -0,0 +1,70 @@
+package com.mcatk.acshop;
+
+import com.mcatk.acshop.commodity.Item;
+import com.mcatk.acshop.commodity.ItemType;
+import com.mcatk.acshop.shop.Shop;
+import com.mcatk.acshop.shop.Shops;
+import org.bukkit.Bukkit;
+import org.bukkit.scheduler.BukkitScheduler;
+import org.bukkit.plugin.Plugin;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class BenchmarkTest {
+
+    @Test
+    public void benchmarkSaveShops() throws IOException {
+        // Setup data
+        Shops shops = new Shops();
+        for (int i = 0; i < 50; i++) {
+            Shop shop = new Shop("Shop" + i);
+            for (int j = 0; j < 50; j++) {
+                shop.getItemHashMap().put("Item" + j, new Item(ItemType.ITEM_STACK, "Item" + j, 100, "sort", "id"));
+            }
+            shops.getShopsHashMap().put(shop.getId(), shop);
+        }
+
+        // Mock AcShop
+        File tempDir = Files.createTempDirectory("acshop_test").toFile();
+        tempDir.deleteOnExit();
+
+        AcShop mockPlugin = mock(AcShop.class);
+        when(mockPlugin.getDataFolder()).thenReturn(tempDir);
+
+        BukkitScheduler mockScheduler = mock(BukkitScheduler.class);
+        when(mockScheduler.runTaskAsynchronously(any(Plugin.class), any(Runnable.class))).thenReturn(null);
+
+        try (MockedStatic<AcShop> mockedAcShop = Mockito.mockStatic(AcShop.class);
+             MockedStatic<Bukkit> mockedBukkit = Mockito.mockStatic(Bukkit.class)) {
+
+            mockedAcShop.when(AcShop::getPlugin).thenReturn(mockPlugin);
+            mockedBukkit.when(Bukkit::getScheduler).thenReturn(mockScheduler);
+
+            // Warmup
+            new FileOperation().saveShopsAsync(shops);
+
+            // Benchmark
+            long startTime = System.nanoTime();
+            int iterations = 20;
+            for (int i = 0; i < iterations; i++) {
+                new FileOperation().saveShopsAsync(shops);
+            }
+            long endTime = System.nanoTime();
+            double avgTime = (endTime - startTime) / (double) iterations / 1_000_000.0;
+            System.out.println("Average save time (Async offload): " + avgTime + " ms");
+        }
+    }
+}