ogr2ogr Spatialite to csv very slow

I am using ogr2ogr to extract point data from a Spatialite db to a csv file:-

ogr2ogr -f "CSV" commandtmp.csv dtm2.sqlite -lco GEOMETRY=AS_XYZ -progress -explodecollections

the Spatialite db is 7GB and it takes days to extract the point data to a 15GB csv file.

Are there any ways to speed this up?