Title: Cache preload functioning
Last modified: September 22, 2020

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# Cache preload functioning

 *  Resolved [bluisier](https://wordpress.org/support/users/bluisier/)
 * (@bluisier)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/cache-preload-functioning/)
 * Hi,
 * I just have a small question to understand the cache preload functionality a 
   bit better. I added a few Sitemaps containing maybe up to 800 links in the space
   available. Do the cache preloader preloads all the urls available in the sitemaps
   or there is a limit (I read about a max limit of 50 in a support thread that 
   can be customized if necessary).
 * If an url has been preloaded, does it mean that even the 1st person to request
   that page will get a cached version from all around the world?
 * thanks for your help
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcache-preload-functioning%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Contributor [iSaumya](https://wordpress.org/support/users/isaumya/)
 * (@isaumya)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/cache-preload-functioning/#post-13438882)
 * Hi [@bluisier](https://wordpress.org/support/users/bluisier/),
 * > I added a few Sitemaps containing maybe up to 800 links in the space available.
 * Technically you can preload all those 800 links. But the problem is that the 
   preloader uses cURL which will eat some server resource for the preloading. That
   is why the default limit is 50 to ensure the preloader doesn’t overwhelm your
   server and eat resources. But if you have more resources to spare you can use
   the `SWCFPC_PRELOADER_MAX_POST_NUMBER` constant to increase the number of items
   to preload. I’ve already explained that in this support thread: [https://wordpress.org/support/topic/swcfpc_preloader_max_post_number/#post-13437448](https://wordpress.org/support/topic/swcfpc_preloader_max_post_number/#post-13437448)
 * I will also highly encourage you to checkout the `FAQ` Tab in the plugin settings
   as you will get most of your question answered there. After that also check these
   threads about the preloader which might also be helpful:
    [https://wordpress.org/support/topic/control-over-preload-speed/](https://wordpress.org/support/topic/control-over-preload-speed/)
   [https://wordpress.org/support/topic/preloader-strategy/](https://wordpress.org/support/topic/preloader-strategy/)
 * > does it mean that even the 1st person to request that page will get a cached
   > version from all around the world?
 * If you have fallback cache enabled, after you flush your whole cache, the preloader
   will start hitting all the pages in it’s queue via cURL now at this point for
   the first request the fallback cache will get generated for that page. It may
   also get cached in Cloudflare cache but that is hard to say as Cloudflare sometimes
   don’t cache a page if the request has been generated by cURL and only catches
   it if the request comes from a proper browser.
    But no matter what the case is,
   lets say CF don’t catch your page on the 1st request but fallback cache has been
   generated for that page as soon as the preloader hits that URL. So, fir the second
   request that comes from a legit browser, the `cf-cache-status` might be missed
   but the user gets the fallback cache version of the page. At this point, the 
   CF has definitely cached the page in it’s CDN (sometimes CF takes some time to
   cache pages) and from this point on forward the response comes from CF CDN server.
 * Hope this helps 🙂
 *  Thread Starter [bluisier](https://wordpress.org/support/users/bluisier/)
 * (@bluisier)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/cache-preload-functioning/#post-13439007)
 * Thanks a lot for the amazing support. It couldn’t be clearer!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Cache preload functioning’ is closed to new replies.

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## Tags

 * [Cache preload](https://wordpress.org/support/topic-tag/cache-preload/)

 * 2 replies
 * 2 participants
 * Last reply from: [bluisier](https://wordpress.org/support/users/bluisier/)
 * Last activity: [5 years, 8 months ago](https://wordpress.org/support/topic/cache-preload-functioning/#post-13439007)
 * Status: resolved