Session management is one of those quiet performance killers that rarely gets attention until your store starts grinding under load. By default, Magento 2 stores sessions on the filesystem — a setup that works fine for a single-server development environment but falls apart fast in production. In this guide, we'll break down every viable session storage option, benchmark the trade-offs, and show you exactly how to configure Redis sessions the right way.

Why Session Storage Matters

Every visitor to your Magento store — logged-in or guest — gets a session. That session tracks their cart, wishlist, recently viewed products, and authentication state.…