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The best cache plugins to speed up your WordPress sites and where I would use them!
The plugins are listed in order of what I recommend most people to try from first to last. In my own personal use case, I love LiteSpeed Cache the most for my high traffic sites (best performance, features, reliability) and then use Swift Performance Lite or WP Performance for smaller sites. FlyingPress, Swift PRO and WP Rocket are nice for clients (and bigger sites) who can pay and need something better than a free plugin.
1. WP Performance (FREE)