Did you know that WordPress' cron, WP-Cron, is not real cron?

It is WordPress simulating scheduled tasks through page requests.

That means background work can be triggered while users are loading pages. On small sites, that may be fine. On larger sites, it blends user-facing work with background work.

That creates unpredictability. Real server cron separates the workload.

Learn why timing matters inside my Make WordPress Fast course:
https://withinwp.com/courses/make-wordpress-fast/