No caching strategy or one that isn't working? I implement and configure a full-stack caching layer: Redis object cache, full-page cache, browser cache headers, and CDN integration.
Installing a caching plugin is one step. Configuring it correctly for your specific server, hosting stack, and WooCommerce setup is another. Many sites have caching enabled but configured wrong — serving stale cart pages, caching logged-in users, or missing the database layer entirely.
WooCommerce checkout and cart pages must never be cached. Logged-in users need different caching rules. Product stock updates must invalidate cached pages correctly. I configure all of this precisely — not with a generic plugin setting.
Measured impact: After setup, I run before/after TTFB tests from multiple locations to verify the cache is working as expected.