Php Codeigniter - improve execution time - php

Question

Actually, i have this script
public function getsbstock()
{
if ($_SERVER['REMOTE_ADDR'] !== $this->localhost) {echo $_SERVER['REMOTE_ADDR'];}
else{
$datetimenow = (new DateTime())->format('Y-m-d');
$url = get_integration_url('smartbill');
$this->db->select('user_id');
$this->db->where('sb_get_stock',1);
$this->db->where('is_smartbill',1);
$this->db->where('is_active',1);
$resArr = $this->db->get('ci_users')->result_array();
foreach ($resArr as $row){
$user_id = $row['user_id'];
$auth = base64_encode(get_sb_email($user_id) . ":" . get_sb_token($user_id));
$cif = get_sb_cif($user_id);
$sbwh = preg_replace('/\s+/', '+', get_sb_warehouse($user_id));
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => ''. $url .'stocks?cif=' . $cif . '&date=' . $datetimenow . '&warehouseName=' . $sbwh . '',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'GET',
CURLOPT_HTTPHEADER => array(
'Authorization: Basic ' . $auth . ' '
),
));
$content = curl_exec($curl);
$prodArr = json_decode($content, true);
foreach($prodArr['list'][0]['products'] as $key => $val){
$productCode = $val['productCode'];
$quantity = $val['quantity'];
$updatedata = array('quantity' => $quantity,);
$this->db->where('sbCode',$productCode);
$this->db->where('user_id', $user_id);
$this->db->update('ci_products', $updatedata);
}
}
}
}
All works fine here, and to make a brifley description, i get from db every users which is active, then for each i m calling an api (different apikeys) and grab data. Api responded me with 1k prod and 2-3 prod for other (just tests), then i update quantity in my database (ci_products) where i have around 15k rows. I see that execution is taking a bit long and i'm not sure if it's normal and if this can be improved somehow :-? it's taking around 20-30 seconds to perform this function.