The reason I made a sample dataset was that I thought it was a bit sluggish querying the GeoPackage file from DuckDB. The query in the image took 2.56 s on the GeoPackage file. I now tried to save the entire dataset into a Parquet file (sorted on county and municipality) and compressed with ZSTD. The same query takes 0.0140s.
Also the Parquet file is 141 MiB compared to 1.18 GiB for the GeoPackage file. The Parquet file is smaller than the original zip file with the GeoPackage file.


