Linked Questions

18
votes
6answers
23k views

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 ...
157
votes
11answers
173k views

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. ...
32
votes
11answers
29k 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 ...
26
votes
10answers
17k 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 ...
33
votes
3answers
58k 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
votes
3answers
7k 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....
2
votes
2answers
14k 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 (...
2
votes
0answers
1k views

kernel_task high CPU consumption and slow Mac

It's not a new problem, I'm facing it for sometime now. My MacBook runs fine all the time but this kernel_task issue occurs whenever it awakes from sleep. No issues with DisplaySleep. I can't put the ...
1
vote
2answers
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 ...
0
votes
1answer
785 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 ...
1
vote
3answers
176 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 ...
1
vote
0answers
232 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 ...
1
vote
4answers
97 views

kernel_task, high CPU and fans going crazy, no applications open, no launch agents/daemons

i've tried to debug this for a couple days straight now and can't find out what's causing the kernel_task to go so unruly. i've removed nearly all my third party kexts, done so many etrepro's, and i'...
0
votes
0answers
67 views

Macbook Pro 15in 2018 hook up to dual monitor lag

Hi I have this Macbook Pro 2018 15inch baseline model. Recently I purchased a 4k LG monitor and I plan to connect it with this MBP together with my older screen which is a Dell 2k monitor. The setup ...
0
votes
0answers
50 views

What side to charge MacBook Pro 2018 with high kernel_cpu task usage?

This is in reference to the answer posted at How to find cause of high kernel_task cpu usage? which suggests that you should move your charging to the right side thunderbolt. However, based on the ...

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