diff --git a/src/Cedar/SW.c b/src/Cedar/SW.c
index 5ef29a47..06679fc8 100644
--- a/src/Cedar/SW.c
+++ b/src/Cedar/SW.c
@@ -783,8 +783,11 @@ UINT SWExec()
 		MayaquaMinimalMode();
 	}
 
-#ifdef DEBUG
-	InitMayaqua(true, true, 0, NULL);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, 0, NULL);
 #else
 	InitMayaqua(false, false, 0, NULL);
 #endif
diff --git a/src/Mayaqua/Microsoft.c b/src/Mayaqua/Microsoft.c
index 6945939b..710cc9cd 100644
--- a/src/Mayaqua/Microsoft.c
+++ b/src/Mayaqua/Microsoft.c
@@ -4569,8 +4569,11 @@ void CALLBACK MsServiceDispatcher(DWORD argc, LPTSTR *argv)
 
 	//// Initialization
 	// Start of the Mayaqua
-#ifdef DEBUG
-	InitMayaqua(true, true, 0, NULL);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, 0, NULL);
 #else
 	InitMayaqua(false, false, 0, NULL);
 #endif
@@ -4748,8 +4751,11 @@ UINT MsService(char *name, SERVICE_FUNCTION *start, SERVICE_FUNCTION *stop, UINT
 	}
 
 	// Start of the Mayaqua
-#ifdef DEBUG
-	InitMayaqua(true, true, 0, NULL);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, 0, NULL);
 #else
 	InitMayaqua(false, false, 0, NULL);
 #endif
diff --git a/src/Mayaqua/Unix.c b/src/Mayaqua/Unix.c
index 7ec8b234..10c4208b 100755
--- a/src/Mayaqua/Unix.c
+++ b/src/Mayaqua/Unix.c
@@ -2766,7 +2766,10 @@ RESTART_PROCESS:
 	else if (argc >= 3 && StrCmpi(argv[1], UNIX_SVC_ARG_START) == 0 && StrCmpi(argv[2], UNIX_SVC_ARG_FOREGROUND) == 0)
 	{
 #ifdef DEBUG
-		InitMayaqua(true, true, argc, argv);
+		// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+		// For normal debug we set memcheck = false.
+		// Please set memcheck = true if you want to test the cause of memory leaks.
+		InitMayaqua(false, true, argc, argv);
 #else
 		InitMayaqua(false, false, argc, argv);
 #endif
@@ -2786,7 +2789,10 @@ void UnixServiceMain(int argc, char *argv[], char *name, SERVICE_FUNCTION *start
 	UINT mode = 0;
 	// Start of the Mayaqua
 #ifdef DEBUG
-	InitMayaqua(true, true, argc, argv);
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, argc, argv);
 #else
 	InitMayaqua(false, false, argc, argv);
 #endif
diff --git a/src/vpncmd/vpncmd.c b/src/vpncmd/vpncmd.c
index 96d751d1..dd23ad09 100644
--- a/src/vpncmd/vpncmd.c
+++ b/src/vpncmd/vpncmd.c
@@ -143,8 +143,11 @@ int main(int argc, char *argv[])
 	SetConsoleTitleA(CEDAR_PRODUCT_STR " VPN Command Line Utility");
 #endif	// OS_WIN32
 
-#ifdef DEBUG
-	InitMayaqua(true, true, argc, argv);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, argc, argv);
 #else
 	InitMayaqua(false, false, argc, argv);
 #endif
diff --git a/src/vpncmgr/vpncmgr.c b/src/vpncmgr/vpncmgr.c
index 584b191e..7456937e 100644
--- a/src/vpncmgr/vpncmgr.c
+++ b/src/vpncmgr/vpncmgr.c
@@ -136,8 +136,11 @@ int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev, char *CmdLine, int CmdShow)
 {
 	InitProcessCallOnce();
 
-#ifdef DEBUG
-	InitMayaqua(true, true, 0, NULL);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, 0, NULL);
 #else
 	InitMayaqua(false, false, 0, NULL);
 #endif
diff --git a/src/vpndrvinst/vpndrvinst.c b/src/vpndrvinst/vpndrvinst.c
index 0411e8e7..2177758f 100644
--- a/src/vpndrvinst/vpndrvinst.c
+++ b/src/vpndrvinst/vpndrvinst.c
@@ -355,8 +355,11 @@ int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev, char *CmdLine, int CmdShow)
 {
 	InitProcessCallOnce();
 
-#ifdef DEBUG
-	InitMayaqua(true, true, 0, NULL);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, 0, NULL);
 #else
 	InitMayaqua(false, false, 0, NULL);
 #endif
diff --git a/src/vpninstall/vpninstall.c b/src/vpninstall/vpninstall.c
index 0164a2b7..e8059b56 100644
--- a/src/vpninstall/vpninstall.c
+++ b/src/vpninstall/vpninstall.c
@@ -1635,13 +1635,16 @@ int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev, char *CmdLine, int CmdShow)
 {
 	INSTANCE *instance;
 	InitProcessCallOnce();
-#ifdef DEBUG
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
 	is_debug = true;
 #else
 	is_debug = false;
 #endif
 	MayaquaMinimalMode();
-	InitMayaqua(is_debug, is_debug, 0, NULL);
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, is_debug, 0, NULL);
 	InitCedar();
 	ViSetSkip();
 	ViLoadStringTables();
diff --git a/src/vpnsmgr/vpnsmgr.c b/src/vpnsmgr/vpnsmgr.c
index e6406861..5712000d 100644
--- a/src/vpnsmgr/vpnsmgr.c
+++ b/src/vpnsmgr/vpnsmgr.c
@@ -134,8 +134,11 @@ int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev, char *CmdLine, int CmdShow)
 {
 	InitProcessCallOnce();
 
-#ifdef DEBUG
-	InitMayaqua(true, true, 0, NULL);
+#if defined(_DEBUG) || defined(DEBUG)	// In VC++ compilers, the macro is "_DEBUG", not "DEBUG".
+	// If set memcheck = true, the program will be vitally slow since it will log all malloc() / realloc() / free() calls to find the cause of memory leak.
+	// For normal debug we set memcheck = false.
+	// Please set memcheck = true if you want to test the cause of memory leaks.
+	InitMayaqua(false, true, 0, NULL);
 #else
 	InitMayaqua(false, false, 0, NULL);
 #endif