HELP! My site grinds to a halt! Once I get more than 12 items in cart!

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Really strange one this. I didn't notice until a customer who placed a large order, said they spent hours trying to get an order together!

Turns out they had 23 items in their order. So I tried myself on my iPhone 11 pro with ios 13.

Sure enough, once I got to about 11 or 13 items in my cart, the page became almost unusable and loading very very slow!

I tested in Chrome on ios and it was the same.

I reached out to Shopify support but the guy could not reproduce it on his PC. He tried on an android device and said it was ok too.

I'd like to get to the bottom of it. My site is

I tried disabling some addons but its just the same. Can anybody help please?