Once saved, the Power BI file size was 289MB! Is this good for 10 million rows? It’s certainly better than the 360MB CSV file but not by much. Certainly not close to the 10:1 compression claimed to be achievable using the SSAS Tabular engine used by Power BI.
I think we can do better than that….
Read on to see the specific optimizations, turning this from a 289 MB data model into a 9 MB data model.