This class is an helpful method to add a caching layer to Advanced Custom Fields. This works adding a new row on database with the entire ACF data serialized for that saved post or option page, and then WITH A SINGLE QUERY done you can have all data back and ready to use.

ACFToArray.php

<?php
/**
 * Created by PhpStorm.
 * User: Matteo
 * Date: 04/07/2018
 * Time: 12:52
 */

/**
 * Class ACFToArray
 * Used to offer a better performance experience on frontend, while maintaining the same old ACF structure
 */
class ACFToArray {
	
	const DB_FIELD_PREFIX = 'acf_cache_array';
	
	protected function __construct() {
		add_action( 'acf/save_post', array( $this, 'saveTotalArray' ), 20000 );
	}
	
	public static function getInstance() {
		static $instance = null;
		if ( ! $instance ) {
			$instance = new static();
		}
		
		return $instance;
	}
	
	/**
	 * Save the array of values when save_post action is fired, so the load is high only on backend
	 *
	 * @param $post_id
	 */
	public function saveTotalArray( $post_id ) {
		$post_info = acf_get_post_id_info( $post_id );
		
		if ( $post_info[ 'id' ] === 0 ) {
			return;
		}
		
		$post_fields = get_fields( $post_id );
		if ( ! is_array( $post_fields ) || ( is_array( $post_fields ) && count( $post_fields ) == 0 ) ) {
			return;
		}
		
		$meta_key = self::DB_FIELD_PREFIX;
		
		
		switch ( $post_info[ 'type' ] ) {
			case 'user':
				$post_id = str_replace( 'user_', '', $post_id );
				update_user_meta( $post_id, $meta_key, $post_fields );
				break;
			case 'comment':
				$post_id = str_replace( 'comment_', '', $post_id );
				update_comment_meta( $post_id, $meta_key, $post_fields );
				break;
			case 'term':
				$post_id = str_replace( 'term_', '', $post_id );
				update_term_meta( $post_id, $meta_key, $post_fields );
				break;
			case 'post':
				update_post_meta( $post_id, $meta_key, $post_fields );
				break;
			case 'option':
				$meta_key .= '_' . $post_id;
				update_option( $meta_key, $post_fields, false );
				break;
			default:
				break;
		}
	}
	
	/**
	 * Get the saved array of ACF fields for specified post_id
	 *
	 * @param bool $post_id
	 *
	 * @return bool|mixed
	 */
	public function getTotalArray( $post_id = false ) {
		$post_id   = acf_get_valid_post_id( $post_id );
		$post_info = acf_get_post_id_info( $post_id );
		
		if ( $post_info[ 'id' ] === 0 ) {
			return false;
		}
		
		$meta_key = self::DB_FIELD_PREFIX;
		$fields   = false;
		
		switch ( $post_info[ 'type' ] ) {
			case 'user':
				$post_id = str_replace( 'user_', '', $post_id );
				$fields  = get_user_meta( $post_id, $meta_key );
				break;
			case 'comment':
				$post_id = str_replace( 'comment_', '', $post_id );
				$fields  = get_comment_meta( $post_id, $meta_key );
				break;
			case 'term':
				$post_id = str_replace( 'term_', '', $post_id );
				$fields  = get_term_meta( $post_id, $meta_key );
				break;
			case 'post':
				$fields = get_post_meta( $post_id, $meta_key );
				break;
			case 'option':
				$meta_key .= '_' . $post_id;
				$fields   = get_option( $meta_key );
				break;
			default:
				break;
		}
		
		// fix the one-man-band problem with array of array containing only 1 element
		if (
			is_array( $fields ) &&
			count( $fields ) == 1 &&
			array_key_exists( 0, $fields )
		) {
			$fields = array_shift( $fields );
		}
		
		return $fields;
	}
}

ACFToArray::getInstance();

function get_fields_array( $post_id = false ) {
	return ACFToArray::getInstance()->getTotalArray( $post_id );
}