[QGIS-Developer] Difference between QgsVectorFileWriter and QgsOgrProvider when creating gpkg?

[Even Rouault]

Hi Nyall,

> But I can't explain this. In both cases the resultant gpkg has a
> spatial index. Does anyone know why one of the methods is so much
> slower than the other? (And ultimately, can we fix
> QgsVectorLayerExporter so it uses the same fast approach!)

Candidate fix and explanations at:
https://github.com/qgis/QGIS/pull/39439

Note that I haven't given this more than unit testing, but given what you 
mentionned, I'm rather confident this should fix the issue.

Even

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