Crawling Time and Number of Files increased after Theme Update

We just update our store to new Theme and we are using Ahref Site Audit and Screaming for Audit purpose. Before theme upgrade our store crawling time was approximately 1hr and after theme upgrade it has been increased to 20hrs and files were 1000-1200 and this number increased to 18K+ .50% files are CDN Images links.

We did not change anything in products, collections and blogs .Just upgrade the theme.

Our store traffic also going down .We checked each url .No URL structure is changed and all 404 are handled .