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This question already has an answer here:

Is QGIS (2.16) multi-threaded?

I do not see multiple processes on the console while running it on Ubuntu.

It only uses one CPU.

Is there anything to do to enable it?

marked as duplicate by underdark qgis Oct 11 '17 at 18:36

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • NOT a duplicate. – tony gil May 28 '18 at 20:54
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Rendering can use multiple cores:

enter image description here

Most processing/analyses are still single-threaded but devs are working on it, see Enabling multithreaded processing in QGIS?

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