The preload of Flash Cache creates the cache of all the public pages of your site, following your patterns, before your visitors open them. Without preload, the cache of a page is created the first time someone visits it. With preload, every visitor gets a page from the cache.

To avoid overloading your server, the preload doesn’t run all at once. It creates the cache of a few pages, waits, and goes on with the next ones. It runs with the WordPress cron, and only while the cache is on in Flash Cache → General Settings.

1. Go to Flash Cache → Preload.
2. Set Enable Preload to On.
3. Check the other options (see below) and click Save Changes.

• Execute Preload: starts the preload now, without waiting for the next run. This button appears only when the preload is on. Above the options you also see if the preload is running now, or when it runs next.
• Enable Preload: turns the preload on or off.
• Cache Taxonomies: also creates the cache of the public taxonomy pages, like categories and tags. It’s on by default.
• Number of pages per execution: how many pages get their cache in each run. The default is 100.
• Time per Preload: the seconds to wait before the next run. The default is 300. Increase it if you get PHP timeouts while the preload runs.
• Disable preload on finish: turns off the preload when it finishes with all the pages, so it runs only once.

If you want to go back to the default values, click Reset to default.

• How to install and setup Flash Cache?
• How to setup Flash Cache patterns?