Fast caching feature

Are there any possibilities to add some fast caching of the output of one action (when invoked by another action) ?

Simplified use case:
* An "importer" action is triggered on demand (i.e. whenever external data has been updated).
** This actions fetches the data, transforms it and uses a file module to persist the transformed data
* Another action will be invoked for each incoming request, retrieve the data from the file lib (and would then apply the service's business logic).

We're having performance issues and caching could maybe help in our case wdyt ? cc @ddragosd