I have around 2-3000 1-bit GeoTIFFs of size 11000x9400. Color 0 should be transparent, and QGIS gets it wrong in the first place, so I used a .vrt file to set all the parameters in one single place.
Problem is, even if I set the layer to be visible only at a small scale, the project takes a lot of time to load in QGIS.
Which is the best way of dealing with all these files? I tried using grass, but I don't see if it can really be faster than QGIS.
Answer
I would say then that your best bet would be to use a WMS (something like MapServer or GeoServer, or their commercial equivalents), and serve your image data as tiles. It'll take a bit of setting up, but it would avoid having to load all the files just to see a small area at a time.
There are plenty of questions and good answers here about setting up a WMS, as well as plenty of tutorials on the web.
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