I have a large number of raster layers for known areas of interest with
different measurements for the same area and timestep stored in different
files.  To reduce the number of layers I've concatenated the measurements
for the same area/time into multi-channel layers with different stylesheets
to display each band.  

So let's say I used to have layers
20190114_BlueCarPark_1.tif,20190114_BlueCarPark_2.tif and so on, I now have
a single later 20190114_BlueCarPark.tif that contains each of the old layers
from Blue car Park on 20190114.  These channels are stored band sequentially
to allow channels to be read in continuous chunks.

However, I've found that this is causing WMS rendering to be quite a bit
slower, my guess is that rather than determining which pixels are required,
Geoserver is maybe reading the entire 3-D array from file and then
subsetting down to the channel specified in the stylesheet.  Is that
correct?  

I'm using the default ImageIO library rather than the extension



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