It's not running facial recognition on photos or something else in the task list (Lightroom drop down top left)?
Nope, facial recognition is deactivated.
Hmm, right now it is at 0,1 to 2,5 % CPU load idle in background. I guess it is living a CPU life of its own;-)
I have similar situation here. the fans are blowing at max speed. What is LR doing and how to fix this?
Make sure catalog-wide facial-recognition is turned off. Look at the section of this page:
Make sure you're not in People view mode.
And at least temporarily pause facial recognition by clicking the arrow that appears as you hover over the identity plate at the top left in LR, and click the two vertical bars if you see them. In my case facial recognition is already paused so there is a Play symbol, instead of the Pause symbol:
@ssprengel thanks for your help including the screenshots.
In my situation the face detection was already turned of but after updating to LR 6.1.1 the heavy blowing did not happen.
Maybe it was the update or something else. Still LR is a heavy user on your system as my battery is empty in about 1,5 hour ...