With Sitefinity, you can configure the way your content and pages is cached. You can configure the following types of cache: Output cache
(stored on the server) and Client cache
(stored on the browser).
Also Sitefinity has the database caching
(Open Access 2nd level cache) - is used to cache database query results for subsequent requests. To control the database caching, click Administration > Settings > Advances > Data
. In single instance mode, database caching is turned on by default.
Using L2 cache can significantly increase the overall performance of your application.
However, this issue looks like very strange because when an Application pool is restarted, all type of cache should be cleaning. May be the problem is something else.
Could you please give us more information about the issue and the widget that you use.
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and vote to affect the priority of the items