What the preload update interval means

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Hi!
A year ago there was a topic about the preload update interval (Clarification what the preload update interval means). But it has two opposite answers. I’m wondering which of these answers is still correct?

Could someone with knowledge of the plugin’s inner working explain to me the meaning of the setting “Page Cache” > “Prime the cache” > “Update interval”?

Is the page cache invalidated after this timespan and a new set of all cached pages is created for entire site?

Or is it the interval between batches of pages are peloaded until the cache is full (set via ‘Pages per interval’)?

Thanks!

• This topic was modified 5 minutes ago by dreamlandia.