Can I do other useful tests tonight?
Maybe just check/confirm that the issue is multithreading on the decoding side (which it looks to be) with:
gdal_translate web_mercator.tif web_mercator_jpeg.tif -co COMPRESS=JPEG -co BIGTIFF=YES -of GTIFF -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -oo NUM_THREADS=ALL_CPUS
where web_mercator.tif is LZW or Deflate compressed -- http://www.spatialys.com My software is free, but my time generally not.
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