Performance issue with getMany() ??

$resources = $modx->getObject("modResource",array("id" => $parentid, 'published' => 1, 'deleted' => 0));
$nameid  = array();
$details = array();
// Find all childs from forums -> event calendar
if($resources){
  $children = $resources->getMany('Children', array("published" => '1', "deleted" => '0'));
  if(count($children)){
      $index = 0;
	  foreach ($children as $child) {
	   $id  = $child->get('id');
	   $longtitle  = $child->get('longtitle');
	   $startDate = $child->getTVValue('startDate');
	   $endDate = $child->getTVValue('endDate');
	   $eventlink = $child->getTVValue('eventlink');
	   $country = $child->getTVValue('country');
	   
	   $nameid[$index]['id'] = $id;
	   $nameid[$index]['startDate'] = $startDate;
	   $nameid[$index]['endDate'] = $endDate;
	   $nameid[$index]['longtitle'] = $longtitle;
	   $nameid[$index]['eventlink'] = $eventlink;
	   $nameid[$index]['country'] = $country;
	   $index++;
	  }
  }
}

// sort list by tv start date
usort($nameid, function($a, $b) {
    return strtotime($a['startDate']) - strtotime($b['startDate']);
});

// get last 5 items (which will be recent 5 events)
$final = array();
for($i = count($nameid); $i >= count($nameid) - 5; $i--){
 if(count($nameid[$i]))
    $final[$i] = $nameid[$i];
}

$final = array_reverse($final);

foreach($final as $key=>$value){
    echo $modx->getChunk('ditto_upcomingevent-tab2017', $value);
}

 
       $id  = $child->get('id');
       $longtitle  = $child->get('longtitle');
       $startDate = $child->getTVValue('startDate');
       $endDate = $child->getTVValue('endDate');
       $eventlink = $child->getTVValue('eventlink');
       $country = $child->getTVValue('country');
        
       $nameid[$index]['id'] = $id;
       $nameid[$index]['startDate'] = $startDate;
       $nameid[$index]['endDate'] = $endDate;
       $nameid[$index]['longtitle'] = $longtitle;
       $nameid[$index]['eventlink'] = $eventlink;
       $nameid[$index]['country'] = $country;
       $index++;

$fields = $child->get('properties');
$fields['id'] = $child->get('id');
$nameid[$index] = $fields;