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Is there any way to speed up raster processing in QGIS? I have seen discussion about speeding up rendering and querying, but not processing.

I am using SAGA tools to calculate morphometrics and the calculations are taking extremely long. I am maxing out my CPU. Does QGIS parallel process using all available cores by default?

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  • If you are maxing out your CPU I would say your CPU is the bottleneck and not SAGA processing.
    – JonasV
    Commented Jul 7, 2020 at 16:07
  • Yes. I am using a Mac and 'Activity Monitor' confirms that I am using all four cores available on my computer for processing.
    – nateroe
    Commented Jul 7, 2020 at 17:55
  • CPU running at 100% is a good sign only if the code makes CPU to do something that makes sense. Without a test case it is impossible to say why your process is so slow.
    – user30184
    Commented Jul 11, 2020 at 11:10
  • This question is old, but since people might come over this: Either the raster is in several parts already, or you can part the raster and then either process each part manually or use PyQGIS to iterate over each file and apply the processing algorithm. This safed me when working with 1.2TB of geotiffs. At the end, you can use the tool Build virtual raster to get the many files to one layer.
    – Homerun_
    Commented May 2 at 9:02

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