For https://eaglemms.com I have a whole bunch of read only data like year/make/model data for cars. Some of my DETS files are 100+ MB and I load them from DETS -> ETS on application init. It's data that only needs to be freshened up once a quarter and it is a hot path for everything else in the app.
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To be fair I've never done it with data that big and it may have compile time impacts.
But depending on lookup you could use the data in a form you like or also into ETS.