Hi, I just installed macOS Sierra on my Macbook Air 2012 and my fan is noisy all the time.
CPU usage is 20%, have somebody same issue ? (PS. on El Capitan was all okay)
Crazy fan
Same here. Maybe because its optimizing the system? It noted me that this could be an impact on the battery, so I guess it's doing a lot of work in the background because it's the first time after installing the new macOS.
Same problem and thoughts here. My Battery on Mid2012 MacBookPro completely drained in 1 1/2 Hours. While using a few apps the fans went crazy, but I was not able to locate the problem. Energy Monitoring wasn't much of a help either. Most power was used by spotlight, buyer not that much…
Yeah, I had some crazy fan action as well. Couldn't figure out exactly what was causing it either. Seems to have settled down overnight thought.
Generally with new OS installs, I've found it to just be Spotlight indexing which causes the fan to activate. As indexing can take a long time to finish, the fan will run quite a bit.
I am finding extremely high energy impact from the Messages app. (Around 40% over an 8 hour period). This was when the app was minimized, and not receiving an unusual number of texts. Maybe something about the messages from iOS 10 is causing it.
I have similar CPU/fan issue with my beefy iMac 5K, mid-2015.
Interestingly enough Activity Monitor.app does not show any unusualy high CPU usage.
Also htop does not show anything unusual, max apps CPU around ~2%
But iStatMenus process monitor points to
DuetHeuristic-BM ~80% CPU
UserEventAgent ~50%
kernel_task ~50%
EDIT:
I noticed that DuetHeuristics-BM is a XPC service launched by Spotlight indexer probably (mentions "mds" in Console.app).
So I disabled spotlight via
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plistAnd the problem went away. CPU is back to normal. Fan is off.
The truth is that I have a lot of of external storage and Spotlight probably tried to index it.