Fid was not fetching because of bad theme javascripts scripting. No any cache plugin could combine or minify this theme properly till date. Now i disabled all the javascripts minification and combination. Clearing all the cache twice and disabled and deleted memcached files. Yet showing few critical javascript errors in search console. See screenshot https://prnt.sc/26on4bl .
I contacted siteground but they blame its theme scripting. Give me an advise how to solve this?