This plugin uses Varnish and ESI to cache the sidebar separately from the page uses Purges so that you can set long expire times without worrying about comments and post edits not showing up immediately..
If you are able to run Varnish, the use case for this plugin is little different than WordPress- Varnish..
Move ESI Widget to the sidebar, populate ESI Widget Sidebar with Widgets you want displayed...
Appearance, Widgets, drag ESI Widget to Sidebar 1.
Drag Widgets that you want to display on your sidebar to the created ESI Widget Sidebar..
Settings, Varnish ESI Widget, Set the Server IP that the plugin needs to communicate with to purge..
Make sure you have configured Varnish with the included default vcl or with one that you have created that allows the plugin to issue BANs..
If your content is engaging and someone browses from one page to the next, most caching plugins need to generate the page and sidebar on fresh visit..
Since this plugin caches the sidebar separately using ESI, the only queries executed on the second and successive pages is the page content not the sidebar...
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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