Create the cache automatically + server load

Could someone please explain to me the “Create the cache automatically” setting. How often does it cache a page this way?

4-6 is enough.

Default is 4 pages every minute. Does that mean it’s literally caching these same four pages every minute?

yes. if you want to be sure that 4 pages are cached every minute, you can set the preload manually as below.

https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/

I recommend your my favorite settings.

Number: 4
Preload: Manually