[QGIS-Developer] How to speed up rendering

[afernandez]

Hello,
One of my project would greatly benefit from a much faster rendering. After 
some testing, the bulk (>99%) of the time is spent at rendering the layer 
with QgsRasterLayer(...,...). What I have also noticed is that rendering 
time does not change with the number of cores, which suggests that the 
renderer might be using a single thread. I checked the API documentation 
but couldn't find anything about multithreading or some other procedure to 
accelerate rendering. I was wondering if anyone has any suggestion or has 
faced a similar difficulty. 
Thanks. 
(Note: The data provider is 'gdal' and I'm using QGIS-3.30) 
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