diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/MainForm.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/MainForm.cs
index 3a649b4..ce156dc 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/MainForm.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/MainForm.cs
@@ -211,7 +211,10 @@ namespace WelsonJS.Launcher
 
         private void userdefinedVariablesToolStripMenuItem_Click(object sender, EventArgs e)
         {
-            (new EnvForm()).Show();
+            using (var envForm = new EnvForm())
+            {
+                envForm.Show();
+            }
         }
     }
 }
diff --git a/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs b/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs
index d43d220..9ca715d 100644
--- a/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs
@@ -16,7 +16,7 @@ namespace WelsonJS.Service
     {
         private readonly HeartbeatService.HeartbeatServiceClient _client;
         private readonly GrpcChannel _channel;
-        private const int HeartbeatInterval = 2000; // 2 seconds
+        private int HeartbeatInterval;
         private ServiceMain _parent;
         private string clientId;
         private string serverAddress;
@@ -25,6 +25,8 @@ namespace WelsonJS.Service
         {
             _parent = (ServiceMain)parent;
 
+            HeartbeatInterval = int.Parse(_parent.GetSettingsHandler().Read("HEARTBEAT_INTERVAL", "Service") ?? "2000");
+
             try
             {
                 serverAddress = _parent.GetSettingsHandler().Read("GRPC_HOST", "Service");
@@ -69,7 +71,7 @@ namespace WelsonJS.Service
                     await call.RequestStream.CompleteAsync();
                     _parent.Log("Sent heartbeat");
 
-                    await Task.Delay(HeartbeatInterval); // HeartbeatInterval 동안 대기
+                    await Task.Delay(HeartbeatInterval); // Wait for HeartbeatInterval
 
                 }
                 catch (Exception ex)