How to edit this function to improve performance in Wordpress? - php

Question

I am using a wordpress/woocommerce theme named "invogue". This theme contain some ajax functions that are called using AJAX, but they are super slow >5 sec each.
Is there any way to edit this function to speed things up ?
the following gets the cart items
#GET CART NAV DATA
public function htheme_get_nav_cart_data(){
#GLOBALS
global $wpdb, $hmenu_helper, $woocommerce;
if ( class_exists( 'WooCommerce' ) ) {
#VARAIBLES
$cart_count = $woocommerce->cart->cart_contents_count;
$cart_link = esc_url(get_permalink(get_option('woocommerce_cart_page_id')));
$cart = $woocommerce->cart->get_cart();
$total_quantity = 0;
#ARRAY OF ITEMS
$cart_items = [];
$cart_count = 1;
#FOREACH CART ITEM
foreach($cart as $item){
$image = wp_get_attachment_image_src ( get_post_thumbnail_id ( $item['product_id'] ), 'full' );
$cart_items[] = array(
'id' => $item['product_id'],
'title' => esc_html($item['data']->post->post_title),
'quantity' => $item['quantity'],
'total' => $item['line_subtotal'],
'link' => get_permalink($item['product_id']),
'price' => wc_get_price_decimals(),
'image' => $image[0],
'price_html' => $this->htheme_return_price_html($item['product_id']),
'qty' => esc_html__('Qty', 'invogue'),
);
$total_quantity += $item['quantity'];
$cart_count++;
}
#ECHO JSON
echo json_encode(array(
'status' => 'active',
'count' => $total_quantity,
'url' => $cart_link,
'cart' => $cart_items,
'symbol' => get_woocommerce_currency_symbol(get_option('woocommerce_currency')),
'total' => $woocommerce->cart->get_cart_total(),
));
exit();
} else {
#NOT ACTIVE
echo json_encode(array(
'status' => 'not'
));
exit();
}
}
the following gets the wishlist items
public function htheme_get_nav_wishlist_data(){
#GLOBALS
global $wpdb, $hmenu_helper, $woocommerce;
if ( class_exists( 'WooCommerce' ) ) {
#GET USER ID
$user_ID = get_current_user_id();
#GET USER WISHLIST
$wishlist = esc_attr( get_the_author_meta( 'user_wishlist', $user_ID ) );
#ARGS
$args = array(
'post_type' => 'product',
'posts_per_page' => -1,
'offset' => 0,
'include' => explode(',', $wishlist)
);
#PRODUCTS
$products = get_posts($args);
#ECHO JSON
echo json_encode($products);
exit();
} else {
#NOT ACTIVE
echo json_encode(array(
'status' => 'not'
));
exit();
}
}