Redis is a key-value database kept in RAM, most often used as an object cache — a middle layer that remembers the results of frequent MySQL queries, so WordPress doesn't have to run them again for every visitor.
What Redis actually speeds up
An object cache in WordPress (through plugins like Redis Object Cache) cuts page generation time under heavier traffic and with elaborate themes or plugins. In WooCommerce, this shows up especially in stores with a large product catalog and many customers logged in at the same time — Redis takes the load off the database instead of querying MySQL from scratch every time.
This is different from page caching (e.g. WP Super Cache or similar plugins), which saves the ready-made HTML of an entire page. Redis caches data inside the application, so it also helps in places where pages can't be cached — for logged-in users, the cart, or the customer account panel.
Who this matters for
The biggest difference is felt by high-traffic sites, WooCommerce stores with many simultaneous sessions, and websites with elaborate logic (membership plugins, search with filters, content personalization). For a simple brochure site with little traffic, the difference is practically unnoticeable — there, plain page caching and a well-configured OPcache give you more.
Redis in the DoSieci lineup
A dedicated Redis is part of the NVMe Performance (256 MB) and NVMe Pro (512 MB) plans — a separate instance per client. We start it for your account and send you the connection details (host, port, password) to enter in your object-cache plugin. If your project would already benefit strongly from an object cache, get in touch and describe your traffic scale — we'll suggest what will have the biggest effect today.