Memory consumption using resources

[martinwurst1]

Hi,
I have a problem regarding memory consumption of my application, which works as followed:
After receiving a fhir-bundle to validate I check for the version of the bundle. With this information I unpack all tar-bundles related to this version and parse them into 'resources', which are kept in a dictionary. The resources are used by the resourceResolver and terminologyService (same object).
Currently I have to support two versions of the bundle. After the setup of the resources for the first version the memory consumption was ~320mb. The newer version has larger and more resources, it takes ~900mb of memory, which is a problem for me.
I am fully aware that I can't blame you for the larger bundles of the newer version, I simply hope you can tell me a way of reducing my memory consumption.

To show you how the application works I made a simplified console application:

https://github.com/martinwurst1/FhirAuConsole