At first here it is necessary to have good knowledge about Joomla system caching – good overview gives this article (old but still valid). JotCache is built on top of Joomla system caching (global caching have to be set on, system (Page) Cache plugin have to be set off – details in JotCache Help).

JotCache is page cache type (fastest for entire page content delivery). Caching is done in the following manner :

  1. in the cache storage are cached pages with all page modules (when they are not excluded in JotCache Component)
  2. passive modules (without any user input) which have output internally modified (e.g. different counters as "Active users") can be taken out of caching processing by means Exclude Location form of JotCache component (JotMarker plugin have to be enabled)
  3. active modules with user input are during active submit not taken from the page cache but they are direct processed. The same processing (without any caching) applies to all Ajax calls. Some active modules with more steps processing (e.g. Polls) can be excluded from page caching by means of Exclude Location form of JotCache component.
    Modules which are inserted by means of any Joomla plugins into page content is not possible to exclude from caching (it is necessary to exclude entire page)
  4. page caching IS NOT ACTIVE for registred users, excluded components/views/selected pages

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