Windows Server 2008 R2上的MFC 64位代码慢于32位

I run the following MFC code:

我运行以下MFC代码:

CArray<CString> l_Arr;
for (int i = 0; i < 2000000; ++i)
{
  CString l_sStr;
  l_sStr.Format("%d", i);
  l_Arr.Add(l_sStr);
}
C