Using the dynamic checkout button on Shopify

Shopify has a dynamic checkout button. It looks like this:

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When you click it, it bypasses the cart step and goes straight to checkout. 

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We recently saw this tweet by Mathias Schrøder and learned about how this affects conversion:

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Option B won with a 15.59% lift in conversion!

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Why does the dynamic checkout button kill conversion? It seems the button breaks the 'backward/forward cache' for your users. Having this cache functional improves the Core Web Vitals and performance for the user.

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https://community.shopify.com/c/site-speed/ironically-shopify-boomerang-preventing-chrome-s-new-back/td-p/1596006 

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Adding a dynamic checkout button will also also prevent you from using checkout upsell solutions.

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