Hi Mitxel,

I think I split up your mails into several topics, else it will get quite a 
chaos to follow up all these ideas.


If you have a layer of raster maps reading the files and scaling the content to 
an upper zoomlevel is 
getting more and more resource intensive the more you zoom out. To avoid 
endless map loading, 
QMS will skip the map if the effort to display it is getting too large.

However if QMS detects overview levels attached to the map it will use them. 
gdaladdo is the tool to 
do so. Things are getting a bit more difficult for insane large map 
collections. gdaladdo will create an 
overview file over all maps combined in the vrt. That might get too large. In 
this case you have to 
create single overview files and combine them in a vrt.

HTH

Oliver




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