A fake imagePyramid sample data is attached.
a level 0 made of 2 corner granules R0001C0001 and R0134C0116
a level 1 made of 1 granule
Data is in EPSG:3003
A reprojecting request is sent in EPSG:900913 covering a wide bbox to be put into a 256x256 tile.
When Advanced Projection Handling and Continuous Map Wrapping are turned off, the result is immediately produced.
When they are turned on, the requests turns into a GridCoverage read operation which use a similar GridGeometry, asking for a huge WIDTH * HEIGHT image, using native resolution:
GridGeometry2D[GridEnvelope2D[-10..679999653, -10..675520900], PARAM_MT["Affine",
This will take forever when dealing with a real pyramid made of thousand of files at level 0 (and may throw OOM error when not using deferred execution)