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lsass.exe cousumes a lot of memory and CPU

I've create Impersonation id which are include WindowsIdentity and WindowsImpersonationContext and I've add the Impersonation in my authentication application after the service is running for a while the lsass.exe process is consuming a lot of memory and CPU Could you please advice me how to solve this issue?

public id Impersonation : IDisposable

{
#region external
// Declare signatures for Win32 LogonUser and CloseHandle APIs

[DllImport('advapi32.dll', SetLastError = true)]
static extern bool LogonUser(
string principal,
string authority,
string password,
LogonSessionType logonType,
LogonProvider logonProvider,
out IntPtr token);

[DllImport('kernel32.dll', SetLastError = true)]
public static extern bool CloseHandle(IntPtr handle);

enum LogonSessionType : uint
{
Interactive = 2,
Network,
Batch,
Service,
NetworkCleartext = 8,
NewCredentials
}

enum LogonProvider : uint
{
Default = 0, // default for platform (use this!)
WinNT35, // sends smoke signals to authority
WinNT40, // uses NTLM
WinNT50 // negotiates Kerb or NTLM
}

#endregion

#region variables

private WindowsIdentity m_userWindowsID;

private WindowsImpersonationContext m_userImpersonationContext;

#endregion

public void LogonWindowsUser(string domain, string userLogin, string password)
{
IntPtr token;
// Create a token for DomainNameBob
// Note: Credentials should be encrypted in configuration file
bool result = LogonUser(userLogin, domain, password,
LogonSessionType.NewCredentials,
LogonProvider.Default,
out token);
if (result)
{
m_userWindowsID = new WindowsIdentity(token);
}
}

public void ImpersonateUser()
{
if (m_userWindowsID == null)
{
throw new Exception('User is not loged on');
}
m_userImpersonationContext = m_userWindowsID.Impersonate();
}

#region IDisposable Members

public void Dispose()
{
if (m_userImpersonationContext != null)
{
m_userImpersonationContext.Undo();
m_userImpersonationContext.Dispose();
}
if (m_userWindowsID != null)
{
CloseHandle(m_userWindowsID.Token);
m_userWindowsID.Dispose();
//m_userWindowsID.Token = IntPtr.Zero;
}
}
#endregion
}

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lsass.exe cousumes a lot of memory and CPU

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What is the carbon footprint of your coffee?