[Qgis-user] Multiple Layers

[Mike Flannigan]

Linux Mint QGIS 3.12.3-Bucuresti.

I have a qgs file with about 470 layers.
Roughly 100 of those layers are grouped together in
7 groups.  All layers are SHP or geojson.  Most
are geojson.  I cannot have all the layers on, but
I can have most of them turned on.  It takes a
couple minutes to load all the layers upon startup.
It counts down slowly from about 30 layers remaining,
to 1 layers remaining over ~3 minutes.

If I have all the layers turned on it either bombs
and closes while I am turning on layers, or a partial
artifact window appears over the Layers panel and
it freezes.

I thought it was because my geojson files had very few
newlines, and looked like this:

"type": "FeatureCollection",
"crs": { "type": "name", "properties": { "name": 
"urn:ogc:def:crs:OGC:1.3:CRS84" } },

"features": [

{ "type": "Feature", "properties": { "id": 133, "name": "Some Trail" }, 
"geometry": { "type": "LineString", "coordinates": [ [ -71.701964, 
44.138121 ],  [ -71.702024, 44.138155 ],  [ -71.702079, 44.138192 ],  [ 
-71.702147, 44.138216 ],  [ -71.702209, 44.138248 ],  [ -71.702266, 
44.138285 ],  [ -71.702327, 44.138316 ],  [ -71.702391, 44.138346 ],  [ 
-71.702463, 44.138354 ],  [ -71.702547, 44.138356 ],  [ -71.702611, 
44.138397 ],  [ -71.702644, 44.138447 ],  [ -71.702695, 44.138441 ],  [ 
-71.702749, 44.138447 ],  [ -71.702813, 44.138450 ],  [ -71.704207, 
44.137891 ],  [ -71.704354, 44.137890 ],  [ -71.704502, 44.137856 ] . . .


But when I added newlines after every lat/long pair it did
not fix the problem.

I welcome any recommendations.  Including migrating to
a geo DB format.  I imagine if I combined my geojson's
into just a few files it would fix the problem, since
I have another qgs file that combines 290 geojson files
into a single geojson layer and it always works fine.



Mike