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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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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2answers
958 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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54 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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1answer
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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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87 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
48 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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2answers
118 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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39 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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78 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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620 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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37 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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1answer
93 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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60 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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83 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
534 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
184 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
37 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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2answers
283 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
228 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
200 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
578 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 ...
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1answer
2k views

mdworker process always at 100%, even when not indexing

I'm trying to understand why mdworker is always at 100% even when (apparently) not indexing. If I open Spotlight, there's no message telling me that a drive is being indexed. If I run fs_usage -w -f ...
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526 views

Macbook Retina 2013 CPU difference

According to Wikipedia, these are the CPU alternatives for the new MBPr 13". 2.4 GHz (i5-4258U) dual-core Intel Core i5 Crystalwell processor with 3 MB shared L3 cache (13") 2.6 GHz (i5-4288U) ...
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371 views

How does Parallels' CPU and ram usage work? When to shutdown virtual machine?

I run Windows 7 using Parallels in host operating system OSX. I have it configured to use 2GM ram and 2 cores on a Retina MacBook Pro with 8GB ram. I'm curious under what conditions I will experience ...
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2k views

OSX High CPU Usage

Are the following CPU usages normal?? From last few days my macbook air is heating too much. And i frequently notice the fan running fast. Top two process have always use over 70% cpu and it goes to ...
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3answers
968 views

Macbook Pro 15 mid 2012 - not able to solve overheating

I've been trying to solve my overheating problem for quite a long time, but had no luck, so I will try to describe it to you and hopefully, someone can come up with some solution. I've also read ...
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196 views

Any patch to manually throttle CPU in OS X 10.8?

I'm running a water-damaged Late 2011 Macbook Air. After letting it dry and changing the battery (which died), the computer is still really slow and after doing some investigation, and applying a fix ...
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1answer
350 views

My CPU is running slow after a system restore (4x0.8 GHz). Turbo Boost is definitely not working. And how can I fix it?

Last weekend, my Macbok Air suffered a heart attack and I ended up doing several hard shutdowns due to an unresponsive system. In the end I had to do a full system restoration. Everything is working ...
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2answers
7k views

View the current clock Speed of a CPU in OS X?

Does anyone know of a utility to see the current speed of the processor? To be clear, I'm not looking for the model/speed of the CPU, but rather what the CPU is currently clocked at (i.e. it will ...
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1answer
136 views

How to use process sample in order to find high cpu usage in Chrome?

I'm trying to figure out what the devil is wrong with Chrome getting 100% cpu once in a while. I sampled the process Google Renderer. Not sure where to go from here. any advice? process sample: ...
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17 views

What's an effective way to proactively spot runaway processes? [duplicate]

Sometimes my Mac ends up with a runaway process; a process that's hogging all the CPU. Often it's Firefox, but I've had a few others recently. Normally I don't spot this for a while until I notice my ...
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1answer
453 views

Get cpu usage per core on the command line

Activity monitor allows users to see the cpu usage on a per-core basis (for multicore machines, e.g. my MacBook Pro). Is there a way to find the percent usage of each core/processor via the command ...
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1answer
125 views

Activity Monitor showing a process that takes 600% CPU? [duplicate]

See Handbrake CPU usage... What's wrong with my activity monitor?
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2answers
281 views

6000 RPM at 65C

For a few days I'm noticing the fans spinning wildly and the CPU temperature is around 65C.. I'm only doing normal browsing and the fans are at 6000RPM. Quite strange. I have MacBook Pro mid 2010 ...
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2answers
1k views

Possible to chain mac minis together?

Is there a guide to extending a mac mini by adding several mac minis together to add cpu and memory capacity?
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3answers
1k views

Stress Testing Your Mac For Optimal Performance?

Stress testing maybe considered a useful way to determine if your Mac is performing at its optimal level of performance & may also be an indicator of faults of any components within your Mac. ...
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2answers
817 views

kernel_task is using 90% CPU, what could be the cause?

I have a 13" MBP late 2009, 2.53 GHz, 4 GB RAM, and on OS X 10.8.3. As soon as I boot up the fans start going at the highest rpm and like I mentioned the kernel_task is always at around 90% when no ...
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53 views

How to diagnose/fix error when booting a G5

I have an Apple G5 and it won boot anymore. When I boot my fan starts to spin like a madman and the screen stays grey. When I try to boot in Safe Mode using Shift-Command-V, I get the error message: ...
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3answers
2k views

What is causing the high system CPU load under Mountain Lion?

I recently began to see some odd behavior on my MacBook Pro on Mountain Lion. I noticed the fans coming up and applications behaving sluggish. I checked the ActivityMonitor (see below) and the ...
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1answer
1k views

MBP early '11 kernel_task over 300% when unplugged

Ok, after reading so many topics and not finding a solution maybe I should join the army of people posting topics about a kernel_task problem with a MBP. Which MacBook do I own: MacBook Pro 13", ...
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1answer
1k views

CPU upgrade on MacBook Pro

I'm thinking about upgrading the CPU in my MacBook Pro from its current 3210M dual core processor to a 3632QM quad core processor. Is there any reason why this wouldn't be a good idea? The socket, ...
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1answer
139 views

/usr/bin/nice and Handbrake

This is really two questions... If a process is run with nice (/usr/bin/nice in the default OS X Mountain Lion installation) will it run processes in equivalent time compared to that process being run ...
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2answers
136 views

How to see which CPU is on the current macine?

I'm looking on the Safe Cflags on the Gentoo Wiki, and I want to figure out how to see which CPU is on a specific machine. On Gentoo I see you can get this with cat /proc/cpuinfo but on Mac I ...
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0answers
110 views

Figure out which app is using Java

If I check my activity monitor there is an instance of java that is constantly taking 5% CPU or more. I know that there is some app that are using java on my system and therefore my question is: Is ...
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1answer
374 views

How do I fix enourmous CPU usage & temperature on MacBook Air when trying to install Wine?

I have a 2012 MacBook Air Intel Core i5 8 GB memory (Mountain Lion). I am trying to install Wine through MacPorts, but after about a minute of building Wine, CPU usage rapidly rises into the 90s, and ...
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5answers
516 views

How can I put heavy load on my CPU for a long period of time?

How can I put my CPU under very high pressure for a long period of time? Are there programs for that that I can keep running ?
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2answers
856 views

Do MacBooks slow down when not connected to power?

I recently read about a device that reported its "minimum CPU speed" (which was 50MHz; max was 1500MHz) and I wondered if my MacBook Air (and other devices like iPhone/iPad) slows down the CPU when ...
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4answers
244 views

Complete Specs for Mid-2010 iMac & Early-2011 MacBook Pro?

OK, so here I am. I've searched anywhere I could but definitely couldn't find what I was looking for. I'm thinking of performing some sort of upgrade (e.g. SSD or memory or CPU) and I'm trying to ...
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1answer
4k views

Why is my Mac's CPU throttled? (Turbo Boost Ratio)

AnandTech has a instructions1 on how you can check the Turbo Ratios for the Mac's CPU. Since they are logged, the information is very easy to find. In Mountain Lion you can do this the following ...
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660 views

There is a process called SH using 100% of my CPU

I checked the Activity Monitor and noticed 2 processes called sh that were eating my CPU. What apps are related to these processes and how can I stop them from eating all CPU?