Saving draft…taking lot of time

Hi
Whenever I try to edit the existing page and suppose add new rows/widgets, automatically it disable “Update” button. At the bottom I can see it as “saving draft”. Don’t know whether it is word press problem. Whenevr I try to edit through Pagebuilder, this problem occurs. I have to exit from the page and do a fresh start. It becomes a problem especially when I’m editing a small section in Homepage. Is there any solution to that?

Note: the site is under construction, so won’t find out much from it. But the real problem is in admin section.

URL: http://fadfinity.biz.md-in-41.webhostbox.net/wp/