Hi,
the reason for the different behavior is that the old QGIS version was
using GDAL to access PG rasters while the new versions uses a QGIS native
data provider which is using ST_SummaryStatsAgg() to calculate statistics,
I believe that this call can become very slow on large rasters and we
should probably reduce the time by using a smaller sample size but this has
to be implemented/fixed yet, feel free to file a ticket on the QGIS bug
tracker.
The good news is the you can still load the raster from QGIS using the GDAL
provider with a connection string that looks like this: "PG:
dbname={dbname} mode=2 host={host} port={port} table={table}
schema={schema} sslmode=disable"
Hope this helps.
Regards.
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