Improve page experience on Shopify ecommerce. Core web vitals and mobile page speed

Job ID: 31799663

Budget: $15 – $25 USD

eCommerce built on Shopify has performance issues which are affecting SEO.

According to search console,
- 40 URLs fail core web vitals
- it has no URLs with a good page experience
According to Google page speed insights, mobile score is 25 and desktop 75

The goal is:
- to fix core web vitals on all URLs
- to improve mobile page speed
- to discover why the site has no longer URLs with good page experience since June
- answer the following questions
- Is it possible to improve this without changing the theme?
- In case that modifications are needed, which changes should be necessary?