The Vivio Swift Cache page gives you access to the details of the Vivio Swift caching features and their corresponding configuration options. The caching processes in Vivio Swift are designed to be extremely aggressive in it's caching process, and will try to cache all pages and URL's that PHP has access to. This gives you the ability to be very selective in what Vivio Swift does NOT cache, by configuring the various exclusions in Vivio Swift's appropriately titled Exclusion section.
On-Access Cache creates a cached version of a page on your site when that page is first hit. The initial page hit is delivered dynamically by PHP, but that dynamically rendered page is stored as a cached page and delivered to all subsequent hits to that particular URL. The On-Access Cache process is subject to all the same rules and exclusions as the Preload Cache, differs in that there is no pre-determined expiration time for the cached page, and pages that do not get requests are not cached.
The On-Access Cache page lets you enable or disable On-Access Cache, and gives you the option to clear your current cache. Clearing your cache will trigger a Refresh Event if you have Preload Cache enabled.
Preload Cache will "spider" your entire site and create a cached version of every page on your site. This process works in the background in order to have minimal affect on your site's performance. Again, the Vivio Swift caching process is designed to be very aggressive, so that as much as possible will be cached, with you telling Vivio Swift which pages you do not want cached using the Exclusion section. The Preload Cache process differs from the On-Access Cache process in that cached pages have a specific expiration time, which is configured in this page (default is 1-hour), and will automatically refresh cache after the time has elapsed. If you wish to do a cache refresh manually, you can also do that from this page.
Note that clearing your cache will trigger a refresh event if you have Preload Cache enabled.
Refresh Events are events that occur within WordPress that will clear out your current cache, and build a new cache using the Preload Cache background process within Vivio Swift in order to have minimal affect on your site's performance.
The Browser Cache options require Apache's mod_headers module to be installed. Check Vivio Swift's "System Info" page to ensure this module is enabled on your system.
Note that setting "Enable Browser Cache" to disabled will disable Vivio Swift from modifying the max-age value for all groups - even if specific groups are still enabled. If the "Enable Browser Cache" switch is enabled, each group can then be enabled and disabled individually.
The Extras page in Vivio Swift Cache section currently provides one option - the ability to remove query strings from static assets.