How can I cache dvt graph results?

Hello colleagues, I need some help regarding dvt graphs performance.
In our application we have big amount of data which the user can filter by adding grouping options, time ranges, etc. For the graph to be updated (the query to be re-executed), the user has to press a "Refresh" button each time he changes the query parameters.
Once the new results are displayed in the graph, the user can change the graph type by pressing either a pie, bar, line or table buttons. As a consequence of this, the query is re-executed and returns the same previous results. This obviously drops the performance of the application.
So, how we can manage to refresh the type of graph (for example from pie to bar) without re-executing the query. Note that the "Refresh" button should always re-execute the query even if the parameters were not changed.
I'll appreciate your help.
Regards,
Nicolas
Edited by: 864814 on Oct 14, 2011 6:05 AM

And by the way how are you switching the graph type? Are you using an af:graph tag and switching just the type? Or are you rendering a complete new graph on your page?

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