add ACF fields in wordpress

I've made a page builder with the WordPress CMS and the plugin Advanced Custom Fields (ACF). The problem is there are lots and lots of fields on a page. This makes the page at the backend (admin area) load forever... In the video below you can see that it takes too long to load the page and you can also see how the page builder works. [login to view URL] for more details plz check attached files we have child theme