*Dennis Burgess*
/Mon Oct 17 14:46:19 PDT 2022/
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but when OGR2OGR gets that data, then does whatever it needs to on GPKG file, 
it only uses about 5% of the CPU

Hi Dennis,
that happens probably because the CPU is a multi-cores / multi-threads CPU with tens of cores / threads and the GDAL/OGR library or tool only uses one core / thread to execute such task. I would suggest you to have a look at [1] and [2] for some performance improvement hints and to ask to the gdal-dev mailing list subscribers if you won't receive enough replies through this mailing list.

Best regards.

Andrea Giudiceandrea

[1] https://gdal.org/drivers/vector/gpkg.html#performance-hints
[2] https://gdal.org/programs/ogr2ogr.html#performance-hints
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