The CPU (Central Processing Unit) is the part of a computer that performs tasks instructed by the computer programs. Its role is somewhat analogous to that of the human brain; it performs simple mathematical, logical, and in/out operation of the machine.

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High CPU usage during disk operations

Early 2009 17" MacBookPro (MacBookPro5,2) 2.66 GHz Intel Core 2 Duo OS X Yosemite 10.10.3 240 GB OWC Mercury SSD, installed in 2010 I've had issues with high CPU usage for a while now. The original ...
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4SNS TCBC - Which Mac Pro sensor is that?

Briefly my Mac Pro (4,1 Early 2009 ) stopped booting which I eventually traced to the plastic clip holding the north bridge down failing. Seems to be a common issue. Replaced the clips and now it ...
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27 views

Why does my Macbook Pro get very hot at seemingly random times? Possibly Safari-related?

I have a late-2014 15" MBP with max specs running 10.10.3, and it usually has no problem handling most of what I throw at it (running multiple resource-intensive apps at once, editing large files in ...
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2k views

Why is the accountsd process eating so much CPU?

Why are the accountsd and securityd processes using so much CPU on OS X 10.10.3? I am on a Early 2011 Macbook Pro. What are these processes for? Is it safe to kill them? The machine has only been up ...
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47 views

launchd using 100% CPU for 20 seconds once per minute

I'm trying to track down a problem with launchd on OS X 10.9.5. Once every minute, launchd spikes to 100% cpu for about 20 second or so, then goes back to minimal cpu usage. So thats ~20 seconds at ...
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90 views

Skype is using 60% to 80% CPU

I have a Mid-2014 15" MacBook Pro with an Nvidia graphics card. Skype uses around 60% - 80% CPU on my computer when I make a call (doesn't matter if it is video or voice call). I tried doing SMC and ...
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52 views

kernal_task super high yosemite, cpu frequency super low

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 ...
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657 views

Why is “Spotlight Web Content” using so much VRAM and CPU?

Why is “Spotlight Web Content” using so much (32.56 GB) virtual RAM and CPU (up to 122.41% apparently)? More interestingly, how can I prevent it from doing so? I am running this MacBook Pro with 4GB ...
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2answers
169 views

How to view CPU clock rate in GHz or MHz?

I am looking to get the new 12″ MacBook and as a result I would like to know the clock speed (in GHz) my current MacBook Air (late 2010) is running at so I know the processor on the MacBook will cope. ...
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How to find Intel SKU for Mac CPUs

Seems like everywhere you can go to purchase a laptop they specify the Intel SKU for each CPU option - except Apple. If you have a Mac, you can apparently find this info using the following command: ...
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6k views

“powerd” process uses a lot of CPU

Oftentimes, after I wake my Mac from sleep, powerd (which is the power management daemon? Which in particular deals with sleeping the Mac and waking it?) uses high CPU, usually around 25% to 50% on my ...
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47 views

Ejecting SD card takes a long time and CPU usage goes up

I'm on Mavericks and after I eject most SD cards, it takes a minute or two and process UASysAgent is taking 80% of the CPU... quite annoying, does anyone else experience this? Something that can be ...
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1k views

VTDecoderXPCService taking CPU

Sometimes I notice CPU load for no reason and I see in Activity Monitor that VTDecoderXPCService is using 15-30% of CPU. After I restart Safari it is ok for some time until it happens again. Any ...
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2answers
195 views

Any way to have CPU temperature in the menu bar?

I tried SMC fan control and Temperature Monitor but it does not update the temperature and I do not wish to change the fan speed.
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1answer
448 views

Processor affinity on mac.

In Linux machines, there is a command called taskset, which can be used to do the processor affinity. In mac(from mavericks) are there any commands to the same job like taskset? Else how one can ...
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1answer
88 views

can utilising the cpu fully (400% for dual-core hyper-threading cpu) damage mbp

I have recently bought a rMBP with i7 4578U intel 4th generation cpu. iStat usually shows cpu temperature readings of ~50 degrees which is normal. Today, because of a buggy library code, my cpu had ...
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78 views

macbook air mid 13 overheating

My set up is macbook air mid 13 with i7 processor and 8GB of ram running OS X Yosemite. Which is plenty for my use, at least it has been. I usually have no more than 3 apps running as notes, reminders ...
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69 views

Application eating ~840,000,000% of my CPU

I noticed that sometime some application are using some impossibly high amount of my CPU according to the Activity Monitor, as the screenshots below illustrate. How comes Activity Monitor displays ...
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4answers
706 views

Is there a way to show each CPU's load separately?

I'm seeking an equivalent of a common Linux based process monitor, which shows a history graph for each CPU core. This can help identify programs that are effectively using all the cores (here, ...
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3answers
3k views

Upgrade to Yosemite: kextd close to 95% CPU

I just gave in to the App Store's constant nagging about upgrading to Yosemite. Aside from an unhappy Chrome, there is this kextd process that's constantly running close to 95% CPU. This results in ...
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1answer
98 views

steps to get a Mac to report CPU and memory load via SNMP?

My group runs a bunch of Mac Pros and xServes of various flavors, and being a fairly recent hire, I am getting up to speed on how to monitor them properly. We use SolarWinds NPM and SAM, and monitor ...
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176 views

Mountain Lion — Finder always freezing

I'm on 10.8.2. Finder always freezes. I have way more CPU and memory than this OS needs. It's only Finder. CPU usage spikes, spinning beachball, the whole thing. I cleared all my caches, disabled ...
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2k views

Retina MacBook Pro running very hot?

I have a late-2013 Retina MacBook Pro, and it gets really hot really easily. I've monitored the temp with htop and iStat and they both show the same readings. It's supposed to be able to play some ...
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1answer
1k views

iPhone: What is `accountsd` and why is it using 80% CPU?

I just got a new iPhone 6 for my SO and noticed that it is quite toasty to handle with the battery draining quite fast. It has been 24 hours since I first set it up. I plugged it into Instruments ...
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999 views

High CPU temperatue on Macbook Pro Retina Mid 2014

I've recently bought myself a Macbook Pro 13" Retina Mid 2014 model. I went for the cheapest model but upgraded the CPU from 2.6Ghz to 2.8GHz. The specs are: 2.8GHz Dual-core Intel Core i5, Turbo ...
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8k views

nsurlstoraged and CPU usage

Since yesterday nsurlstoraged is constantly using a huge amount of CPU. Nothing shows up in the logs but opensnoop shows that the process is accessing ...
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66 views

Anyone with Mac Pro, please help with CPU question! [closed]

I'm about to buy a Mac Pro, possibly an iMac instead, in a few days for extensive 3D and video work. I was able to try an online CPU stress test which renders complex video frames on the iMac but I ...
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1answer
2k views

very frequent CPU usage 100% for systemstats

I have macbook retina pro 2013 version with 16gb ram and OS X 10.9.3. This machine works just fine, except just one problem. systemstats hits 100% CPU usage very frequently, at least 6 times a day. ...
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28k views

mds and mds_stores constantly consuming cpu

mds and mds_stores are constant CPU consumers even when I think nothing should have changed on the hard drive. activity monitor I have a circa 2009 Macbook Pro. Lots of software installed over the ...
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540 views

Mail.app causing Macbook fans to spin loudly and turn CPU up to 100%

Over the past few days on My Macbook on Mountain Lion 10.8.5, when I refresh my email in Mail.app, it gets stuck here and then the fans start turning on(along with the CPU running 90-100%). I can ...
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3k views

iTunes now takes up 100% of CPU since updating to 11.3

UPDATE: The issue seems to be at least related to what konqui mentioned in the Comments since I do have a large library of podcasts. However, if this was merely related to re-indexing then one would ...
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14k views

Why does Google Chrome Helper spike my CPU?

This has been happening on and off since I switched to a mac at work. Google Chome Helper occasionally runs my cpu into the red and has the fan spinning madly. Sometimes restarting Chrome fixes the ...
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73 views

Does anyone know of an alternative to CPULED that is not connected to the AppStore?

Just want something similar (UI/ease of use) that is a freeware. :) I can make a copy of the app that is installed in Applications but when I install it in another Mac, it wants me to login to the ...
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150 views

MacBook Air CPU Limit Notification

My MacBook air is intermittently slowing down and has very high fan speeds. It went to apple for a replacement logic board and has had these issues since the replacement. Running application monitor ...
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1answer
262 views

MacBook Air slow after waking from sleep

The backlight on my MacBook Air broke about a week ago and it fixed by Apple by them replacing the logic board. Since I've got it back I've had a couple of issues. Firstly, the machine wouldn't work ...
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503 views

Changing CPU frequency policies in OS X

I have Core i5 processor with nominal 2.3 Ghz speed. But, according to Intel Power Gadget, most of the time the frequency is much lower. Even during intensive usage. It's 0.8-1.6 Ghz. I noticed that ...
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67 views

is iPhone 5S 2-times faster than iPhone 5 at Graphics Task (like Gaming) due to 64-bit CPU?

Phil Schiller talked about "iPhone 5S" This is the first-ever 64-bit processor in a phone of any kind. I don’t think the other guys are even talking about it yet. Why go through all this? The ...
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1k views

How to limit cpu frequency in OS X?

The OS X kernel does control this directly since below 5% my CPU gets locked to 1.2GHz instead of the normal 3.7GHz so there has to be a way to control the CPU speed. I am aware of this question ...
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6k views

Excessive CPU usage from sysmond

Does anyone know what the sysmond application does on OS X? Lately it has been taking about 25-30% cpu constantly for no apparent reason. Things I've tried so far: Reboot SMC reset PRAM reset ...
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44 views

crashing MBP :(

I have a MBP from 2010 with 2.4 Ghz Intel Core 2 Duo and 4 GB of RAM. Lately I am getting many kernel panics when my MBP is under high load, such as when copying, playing video's, editing etc. ...
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281 views

CPU at 100%, but no processes showing significant usage

Situation: All 4 cores maxed out. Mac noticeably lagging. Attempted Solution: (Reveals wildly contradictory information.) Closed all applications Opened Activity Monitor Totaled all Process ID ...
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92 views

I7 4700 MQ has 2 cores istead of 4 cores [closed]

My laptop window 8.1 ,processor Intel I7 4700 MQ appears 2 cores in PC property.It must have 4 cores , 8 threads.Please somebody tell me why and how to fix it to 4 core actually.Thank you
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151 views

How to group cpu cores in Activity Monitor (Mavericks 10.9.2)?

I've got MacBook Pro with 4 cores and Hyper-Threading(HT). I've also got a MacBook Air with two cores and HT. On both devices I've set Activity Monitor to show CPU History (View -> Dock Icon -> Show ...
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2answers
2k views

Flash higher CPU usage under OS X than Ubuntu?

I recently installed Ubuntu 13.10 on a 2011 late Macbook pro. With the same version chrome and pepper flash plugin and flashblock extension to block irrevalent flash. When I watch some flash video ...
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2answers
594 views

How long can my MacBook Pro sustain greater than 100% CPU usage?

The Activity Monitor app says my macbook pro 10.7.5 is at 300% CPU usage when I'm trying to install and sync my Bitcoin-Qt client. I let in run like this with the fan going crazy for 4 hours without ...
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1answer
44 views

Does Apple design its own CPUs?

We're having a little debate here at work. Does Apple design its own CPUs? And by CPU design I mean what is on Wikipedia. I'm also interested to know the manufacturers of Apple's CPUs/SoC (maybe ...
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356 views

After market upgrade of the new MacPro (late 2013) CPU?

I was thinking, anybody having there hands on a new MacPro (the late 2013), would it be possible -in time- to swap the CPU from a new MacPro? Its the CPU soldered to the motherboard? Looking forward ...
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2answers
376 views

iPhone 5s: benefits of 64 bit processors if no more than 4 GB of RAM?

My understanding is that the (main) reason of having a 64 bit processor, is to be able to use more than 4 GB of RAM. In PCs, it is now very common to have more than 4GB of ram, and to really be able ...
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1answer
559 views

Mac mini 2011 mid - temperature issue

I have a mid-2011 Mac mini with an Intel i5 2.3 GHz processor. When I checked the temperature, it was 90 degrees Celcius. The computer was running for three days. It didn’t work on anything. Is this ...
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2answers
1k views

MacBook Pro Retina, questions about 2nd monitor for gaming

I have a MacBook Pro Retina, and I'm gaming a lot with bootcamp windows 8. I'm considering buying a external monitor for better gaming (might be a BenQ, has to be 120Hz). My questions: Does a 2nd ...