Linked Questions
27 questions linked to/from How to find cause of high kernel_task cpu usage?
20
votes
6
answers
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kernel_task consumes 500% CPU on AC power, sometimes [duplicate]
Typically, my kernel_task process uses 1-4% CPU and 100-700MB of memory. However, sometimes when I have the power adapter plugged in, the CPU usage jumps to around 500% (8 cores) and stays there until ...
- 1,110
6
votes
1
answer
3k
views
Mac book pro 16 slows down completely when connected to an external monitor [duplicate]
I have a Macbook Pro 16" and recently purchased a 24" (HD) Dell monitor via HDMI (via a USB-C to HDMI converter)
After about 20m of usage, my mac comes to a crawl and really slows down.
It ...
- 449
1
vote
0
answers
56
views
CPU constantly hot with low usage [duplicate]
My 2019 16" MacBook Pro with 2.6GHz 6-core i7 processor on macOS 11.3.1 is constantly running hot at ~60°C even when the CPU usage is only 8-10%.
I've checked the ActivityMonitor, but no app is ...
- 861
169
votes
11
answers
188k
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WindowServer high CPU on Yosemite
This is a follow up to So my Yosemite install is slow - what to do?
Since installing Yosemite a week or so ago my machine is very sluggish. I am a web developer so I change windows/apps a lot. ...
- 2,278
40
votes
14
answers
43k
views
Why is kernel_task using so much CPU?
I have a Macbook Pro Retina with the following hardware:
Model Name: MacBook Pro
Model Identifier: MacBookPro11,1
Processor Name: Intel Core i5
Processor Speed: 2.4 GHz
Number of Processors: 1
...
- 658
32
votes
10
answers
21k
views
CPU usage is too high with Yosemite and an external monitor
I use Yosemite 10.10.4 on my MacBook Pro (2012).
I used to work with an external monitor: Apple Thunderbolt 27" monitor.
The issue is that, according to Activity Monitor, the kernel_task process ...
- 479
36
votes
3
answers
60k
views
What exactly does kernel_task do?
I'd just like to know what it is that kernel_task is responsible for. Also, what's an acceptable maximum RAM and CPU use for it?
- 14.5k
19
votes
4
answers
14k
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macOS artificially restricts speeds to 100 Mbps over Ethernet
Overview
I have a 1 Gbps connection via a Cat 6 Ethernet cable to my MacBook Pro (16-inch, 2019). I am on macOS Big Sur 11.6 on the Intel Core i9 if that helps.
The Ethernet cables connect to the ...
- 449
14
votes
3
answers
8k
views
kernel_task hundreds of % CPU yet cpu frequency is being lowered
I'm trying to solve the mystery of a crazy high cpu usage on kernel_task.
MacBook Pro (Retina, Mid 2012), 2.7 GHz Intel Core i7, Yosemite 10.10.2
I saw some advice to download the Intel Power Gadget....
- 883
2
votes
2
answers
18k
views
Are these normal temperatures?
I just got a new MacBook Pro 2017 128GB no-touchbar, bought it in the refurb.
I'm doing a bit of Photoshop ( I know it's not the best MBP, but I really need it right now for work ) and I have Safari (...
- 41
2
votes
3
answers
3k
views
High CPU usage by system
I'm having by time to time problems with my OS running really slow because the System uses a lot of CPU (it stays like this ~30min). I've checked different articles on the internet in regard to this ...
- 131
1
vote
1
answer
6k
views
Macbook slows down when connected to external monitor and power supply
I have a Macbook Pro (Retina, Mid 2012) with the following configuration: 2.3 GHz Quad-Core Intel Core i7, 8 GB 1600 MHz DDR3, Intel HD Graphics 4000 1536 MB
I use Dell P2419H as my external monitor ...
- 111
6
votes
1
answer
2k
views
Macbook Pro 2019 overheating with external monitor
Problem
My Macbook overheats insanely.
After investigating a bit, I found out that the correlation is extremely strong with having it plugged in to an external monitor with the Macbook Pro monitor ...
- 171
4
votes
0
answers
2k
views
MacBook 2020 constantly disconnects USB 2.0 devices
The Problem
Since I got my new Macbook Air 2020 (with i5 Upgrade), I encounter a strange and annoying problem every day: The MacBook suddenly looses connection to my USB devices. Namely my external ...
- 569
1
vote
2
answers
1k
views
MacBook Pro 16" running hot
I have a MacBook Pro 16 inch base model. I am a programmer, which means that it is running hot when I am working. When I am working it is between 70-80 degrees celsius, but when I open activity ...
