Redis object cache for WordPress on a VPS
Set up Redis as a WordPress object cache on your own VPS: bind it to localhost, size maxmemory, pick an eviction policy, and verify the cache is real.
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Disable wp-cron and use system cron
WP-Cron only fires when someone loads a page, so it stalls on quiet sites and piles up on busy ones. Move it to system cron with WP-CLI, and verify it ran.