Ecommerce product page loading issues

Can anyone advise? I made an Ecommerce Webflow site for my girlfriend’s art shop with the intention of getting individual products to list well in SEO. But barely any are making in the SERPS. After months and months. The content is unique. The images are compressed and metadata is accurate. On a load test, I see the CSS is taking 5 seconds to load! But CSS minify is eneabled

Can anyone offer any helpful tips to optimise the product pages loading issues?

Here is my site Read-Only: LINK
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