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What is the WP-Cron
The WordPress WP-Cron is used to run scheduled tasks within WordPress core, as well as plugins such as WooCommerce.
The WordPress WP-Cron will run on each page visit by a visitor, this can result in the WP-Cron running multiple times on busy sites and con under up slowing down
The WordPress cron will run automatically when a visitor visits your site. This can cause an unnecessary load on your server or slow down the single request and result in a slower load time of your site.
A popular option is to disable the automatic WordPress cron, and replace it with a manual cron.