Questions dealing with performance of Apple hardware or software, especially about troubleshooting or improving poor performance.

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7
votes
2answers
3k 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....
7
votes
5answers
4k views

How to keep an SSD in shape on Yosemite?

As of OS X 10.10, Apple uses kext signing. Ever since it has become difficult and dangerous to manually activate TRIM for third-party SSDs on OS X. That means users with non-Apple SSDs will sooner or ...
106
votes
8answers
65k views

How to simulate slow internet connections on the mac

What's a good software solution to slow down internet connections on the mac for testing and simulations? My primary need is when testing code in the iPhone / iOS simulator, so slowing down the ...
41
votes
13answers
45k views

Why would I disable swap file in Mac OS X?

I came across a thread about installing an SSD drive in MacBook Pro. Someone in the comments also recommended to disable the swap file but didn't say why: sudo launchctl unload -w /System/Library/...
6
votes
2answers
29k views

Using memory with a higher MHz rating? [duplicate]

Can MacBook Pro's successfully support and fully exploit RAM of a higher MHz rating than that which they ship with? For example, take my 15" MacBook Pro (Late 2011) that ships with 4GB of 1333MHz ...
101
votes
10answers
77k 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. ...
17
votes
8answers
17k views

Time Machine ridiculously slow after El Capitan upgrade

I recently updated to El Capitan, and told Time Machine to backup. It got stuck on Preparing Backup for hours, so I stopped it, deleted the InProgress file, rebooted and tried again. After ~30 mins, ...
5
votes
1answer
8k views

How can I control (start/stop) applications and services that start up after reboot?

I have a Mac that is slow when using the internet, but other PCs on the same connection aren't as slow. I suspect there are too many AV scanners running concurrently, or there is some process that ...
4
votes
1answer
169 views

Is it good to keep apps closed on iOS devices?

Is it better to keep apps closed (double tap home button, hold the icon, and exit the app), as much as possible on iOS devices? I know the more apps one has open, the more RAM, for example is used, ...
33
votes
3answers
20k views

What are the differences between journaling HFS+ and non-journaling HFS+?

I'm about to format an external hard disk drive (HDD). What are the key differences between journaling HFS+ and non-journaling HFS+? Apart from the fact that one has journaling and the other does not,...
8
votes
5answers
27k views

What's the fastest connection speed / shortest elapsed time using Migration Assistant?

When using Migration Assistant to move users, files, and folders from an old Mac to a new one, you have a few different choices, depending on the Macs involved. Presuming that both Macs have ...
17
votes
5answers
2k views

Does the use of SSD give one a dramatic performance boost?

I use Mac book pro 15", and it's time to buy a new one. For HDD, now I see a new option of SSD, which is pretty expensive. I can expect shorter boot-up time and faster access of files, but I'm not ...
12
votes
5answers
1k views

What scenarios benefit from Mac OS X allowing apps to run when no document windows remain?

As a rule of thumb programs on Mac OS X stay running when you close all their document windows. This is the behavior I noticed in MacVim, VmWare Fusion, Chrome and host of other applications. I ...
5
votes
3answers
14k views

What is an SSD drive's negotiated link speed?

When I look at my Apple SSD TS256C (Toshiba) in the System Profiler on my MacBook Pro (Late 2011), I see: Link Speed: 6 Gigabit Negotiated Link Speed: 3 Gigabit Why is that? Does that mean ...
4
votes
1answer
10k views

Ridiculously slow MacBook Pro

I have a MacBook Pro (I think mid 2012). About three months ago it started running really slow, so I renstalled the OS with a recovery partition. For a few weeks it ran very well with an overall very ...
13
votes
2answers
10k views

Computer slows when battery is low

My Macbook Pro running Mountain Lion slows down dramatically when the battery is below 4-5%. All the applications running are very slow to respond, and several have the "Application not responding" ...
2
votes
3answers
6k views

Mac book pro is very slow

I have a mac book pro late 2011. It has a very powerful hardware. But it is very slow. For example when I'm making expose geisture, there appears 'loading circle' and mac lags for 4~5 seconds. Same ...
31
votes
5answers
5k views

Do computers slow down as they age?

I have an eMac I bought in 2004. I just used the system restore CD to re-install Panther, iLife '04, Internet Explorer for Mac(!), etc. I don't have any timed specs from "back then", so I can't answer ...
22
votes
3answers
2k views

How can I figure out which tab in Safari is using CPU?

I usually have several tabs open in Safari in the background, and sometimes I see it taking up an unusual amount of CPU (PluginProcess or WebProcess). How can I figure out which tab (or tabs) is ...
9
votes
8answers
8k views

Yosemite: Accessibility zoom + multiple monitors = poor performance

Ever since upgrading to Yosemite, the accessibility zoom feature is unusable when connected to an external monitor. Steps to reproduce: Enable Zoom in System Preferences - Accessibility. Connect an ...
26
votes
5answers
1k views

Is there any way to speed up my iPhone 3G since upgrading to iOS4

I have recently upgraded my iPhone 3G to iOS4 and there is some noticeable performance issues will some of the basic tasks (text messaging, loading application, etc.) I have restarted my iPhone and ...
6
votes
4answers
1k views

How can I best use an SSD?

I have a Mac Pro, and I've added an Intel 80GB SSD to improve performance in LightRoom and Photoshop. So far so good. But after moving all of my current work, catalogs, etc. to the SSD, I still have ...
7
votes
2answers
677 views

How can I diagnose really poor performance of my 13" MBP 2011 on 10.6?

The specs are: 2011 MBP 13" Core i7 4Gb RAM 320Gb HDD (not SSD) I use the system for work everyday, I almost always run the following: Mail.app Chrome (7-10 tabs) Terminal (2-3 sessions) Skype ...
4
votes
5answers
3k views

Can spotlight be reset when it misbehaves, is wrong or constantly indexing?

On my 4-month old mid-2012 MacBook Pro I observe that Spotlight seems to want to ALWAYS re-index. I frequently notice that the performance will get unbearably slow and I can hear the hard drive ...
13
votes
3answers
11k views

How would enabling FileVault alter my system and TM performance?

What are the pros and cons, performance-wise, of enabling and using FileVault? Is there any at all, or does it slow a computer down significantly or on the contrary speed it up? Also, what effect will ...
11
votes
3answers
13k views

How can I speed up SD card writing speed (using /dev/disk*) on a MacBook Pro?

I've been installing some linux distributions onto an SD card from my MacBook, although they take over an hour to transfer a few hundred MB (using dd and /dev/disk1). If you look at the above ...
6
votes
2answers
14k views

How can I disable CPU throttling and CPU disabling?

On a 2011 17" MacBook Pro (i7, 10.6, 16GB ram) I do not have any options in the energy saver preference panel to control CPU throttling. I need to be able to disable CPU throttling for short periods ...
2
votes
1answer
1k views

Why do I get serious execution lag on clicks, application switching and general usage

I have an MBP 8.1, early 2011, 13 inch, Mountain Lion. Whenever I leave it on for more than a couple hours, I get serious execution lag on every command. For example: I click something (a link, ...
2
votes
2answers
1k views

Is there a task manager for OS X El Capitan?

Something's causing my Mac to bottleneck on startup and on wake. I'm curious if I can isolate this by leaving a monitor program running so I can see what's eating up the CPU. How can I check CPU ...
1
vote
2answers
4k views

iPhone slows down entire home network

Ever since the automatic upgrade to iOS 7, an iPhone that connects to my Linksys WRT54GL router running DD-WRT, slows down all other connections, from any other device. Download speed is reduced by a ...
10
votes
5answers
18k views

Using FaceTime without the video

I have a first generation MacBook Air that heats up a lot when playing videos, and almost grinds to a halt after a few minutes of playback. Is there a way I could turn off the video during FaceTime ...
5
votes
2answers
4k views

Constant SMC resets required

I have a 2009 Macbook Pro, 4GB RAM, 2.26GHz Intel Core 2 Duo. Check battery warning but nothing else overtly wrong. Since I updated to Mavericks (from Snow Leopard), it has been running incredibly ...
4
votes
2answers
4k views

Help identify what uses the CPU when the Activity Monitor list of all processes does not help

Problem After rebooting, and with only Activity Monitor open, my MacBook Pro (10.6, i7) shows a very high idle % (98% or higher) but then shortly after drops down to 40% - 50%. In the Activity ...
4
votes
2answers
6k views

is it worth it to install SSD internally, instead of using USB3?

I prefer to keep my boot drive external, so that I can quickly boot using another Mac if my primary Mac fails. I use a USB3 drive dock to connect the drive to my Macs. I bought a 120GB SSD w/SATA3 (6....
3
votes
3answers
4k views

Mac Pro Memory - Should I use 8 RAM slots in dual-channel mode or 6 RAM slots in triple-channel mode?

I have a Mac Pro tower with a 2 x 2.66 GHz 6-Core Intel Xeon chipset, and 8 RAM slots. I have been told because of the processor's triple-channel memory capability that I should be installing RAM ...
2
votes
7answers
17k views

After installing Lion my mac became super slow

After installing Lion, my macbook pro became unbelievably slow.. what could be the reason? Safari sometimes freeze for 30 seconds (in particular when there's Flash content). When I open mail after ...
6
votes
4answers
9k views

How can I boost the performance of my MacBook?

I know that upgrading my MacBook with extra RAM can help boost the general system performance. Recently, I upgraded from OS X 10.5 to OS X 10.6.8. I thought that my RAM upgrade would speed up my ...
6
votes
3answers
5k views

Mac Mini suddently terribly slow

My Mac Mini crashed. I restarted and after a long time the screen remained gray. I then started in single user mode, did a disk check (fsck reported no problems) and rebooted again. The Mac is now ...
5
votes
4answers
1k views

Does moving my home folder to an non-boot drive decrease performance?

I'm going to get an SSD, making that my boot drive and moving the existing hard drive to the optical drive bay. I will keep my data on the original hard drive. MacPerformanceGuide.com says "If the ...
5
votes
4answers
1k views

Are there general or specific iOS6 performance issues on iPhone 4?

I would like to upgrade my iPhone 4 to iOS6 but I'm wondering if I will get performance loss (as when I upgraded my iPhone 3G to iOS4 : terrible). Can someone confirm that it won't affect my day to ...
4
votes
1answer
8k views

How to find out which Safari tab is using massive memory?

As described in my other question, Safari on OS X 10.6. is causing me massive problems (with my way of working like having many tabs in Safari open for a long time). I just realized that after ...
2
votes
1answer
4k views

Safari makes my MacBook incredibly slow - what to do?

System configuration I'm working with a MacBook 2,16 GHz (13" white with the max. 3 GB RAM from about 2007) and "Snowleopard" OS 10.6.8. The problem: performance After a while, the MacBook becomes ...
2
votes
1answer
629 views

How can I disable CPU throttling on Late 2006 MacBook with no battery?

The problem I am experiencing is that if the battery is not present, the CPU is automatically throttled. I have done some searching and have found that this is apparently by design, "in case the ...
2
votes
1answer
2k views

New MacBook Pro slow performance, battery not working

I have a very recent (mid-2014) MacBook Pro Retina 15" that has been working fine since I got it (about two months). Suddenly, it has begun to run very slow in all apps, even though CPU usage is very ...
1
vote
4answers
624 views

Best version of OSX for 2008 iMac?

(This is a follow-up to How to improve old, slow iMac -- new SSD? Or more RAM?) I replace the HD on our old 2008 iMac 8,1 with an SSD, and it seems much faster. However, it WAS running 10.9; now it's ...
1
vote
2answers
4k views

Is upgrading an iMac to an SSD over USB 2/FireWire an upgrade?

I bought the smallest 21" iMac model of the 2011 update cycle. I was planning on having the HDD replaced with an SSD later on. Turned out this would not be an option. So I'm either stuck with the ...
1
vote
1answer
970 views

Is there a problem with GeForce 750M performance on gaming?

I play games on my Mid-2014 retina MBP, which has both Iris Pro and GeForce 750M 2GB. One of the games that I play (League of Legends, which has a 'beta' OS X client, but I highly doubt that this is ...
1
vote
2answers
6k views

How fast is 256GB to 128GB on mid-2013 MacBook Air?

I've tried finding the comparison reviews of the performance differences between 128GB and 256GB PCIe SSDs of mid-2013 MacBook Air 11" and 13" (which now have been carried over as the early-to-mid-...
1
vote
4answers
15k views

High memory usage, macbook pro retina feeling sluggish

My Macbook Pro Retina seems to be feeling sluggish and I don't think it should at all. I'm running: photoshop, 1080p movie on VLC plugged into a Thunderbolt Display. Looking at the activity monitor ...
1
vote
1answer
393 views

troubleshooting Finder (and disk access?) speeds — Dropbox extension problems?

I am on Yosemite 10.10.3, though in the public beta program (which now is in sync with releases). I am also in the Dropbox beta, now on 3.5.58, for what it's worth. File access is curiously slow now. ...