Security checkHash Takes Long Time

Hi,

checkHash method under security class takes 25-30ms. Is it Ok?

private function _checkUser( Request $request ) {

    $username = $request->getQuery( 'username' );
    $password = $request->getQuery( 'password' );

    //Check username and password
    $user = Users::findFirst( array(
            "username='$username'",
            "cache" => array( "key" => "users-cache", "lifetime" => 20 )
        ) );
    if ( $user ) {
        if ( $this->security->checkHash( $password, $user->password ) ) {
            return true;
        }else {
            return false;
        }
    }
    else {
        return false;
    }
}

Without checkHash it takes only 4 ms.

Please suggest.

Thanks & Regards Tapan Thapa