The Mendix has performance issue for big migration to Database

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Since we are migration to Mendix Database with the csv importer, but that is very slow performance for high volume tables.    We have a source data from old database (high volume), and need to migrate them to the Mendix tables for running new Mendix App in Production with the existing data from old database.   I know the Mendix had generated own id (Primary key), so question is how we can generate the running id that's Mendix acceptable ?   The Mendix Microflow is not an option, Mendix REST API not an option too, we really want to inject data directly to database. 
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