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<http://schema.org/text>
"You can’t just rely on caching for site speed solutions because you can run into problems when visitors land on pages that cannot be cached. For instance, an eCommerce site with a check-out page can’t be cached because of its dynamic nature. However, if you haven’t optimized your backend and frontend, the checkout experience could be painfully slow, causing the buyer to abandon their cart. So, it is recommended to optimize your backend and front first for caching. After that, consider caching the files that don’t change frequently."
<https://w3speedup.com/how-caching-optimization-can-help-improve-your-website-speed/>