WP Rocket also have it’s own self-hosted crawler bot that will visit your site and generate cached the files so that when human visitors come to your site, they immediately get the fast, cached version of the page. We also have a sitemap preload feature.
WP Rocket v3.3 Changelog
New feature: Lazyload picture elements (#1563) New feature: Lazyload background images added inline in the HTML content with the background-image CSS attribute (#1563) New feature: NGINX FastCGI Cache Add-on, to synchronize WP Rocket cache purge with NGINX Cache purge (#1565) Enhancement: Update the way lazyload is applied to catch more images and be more compatible (#1563) Enhancement: Add preload fallback system for sitemap preload in case there is an error during parsing of the sitemaps (#1306) Enhancement: Automatic compatibility with Pressable hosting. WP Rocket is now usable on Pressable (#1572) Enhancement: Ignore utm_term parameter during caching when used in the URL (#1564) Bugfix: Prevent cache file not being generated if filename is longer than 255 characters (#1538) Bugfix: Prevent PHP warning when using the GDPR plugin (#1537)