Questions tagged [performance]

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

Filter by
Sorted by
Tagged with
14
votes
3answers
6k 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....
12
votes
5answers
7k 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 ...
144
votes
8answers
110k 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 ...
52
votes
10answers
39k views

Can I manually limit the %CPU used by a process?

I would like to limit the amount of CPU time dedicated to certain processes (e.g. Firefox, Safari, ...). I can't understand why such programs, even when not used (nothing loading, no animations, ...
51
votes
13answers
57k 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/...
8
votes
2answers
46k 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 ...
8
votes
2answers
22k 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 ...
128
votes
10answers
149k 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. ...
26
votes
5answers
19k 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 ...
7
votes
1answer
4k views

Is it possible to disable CPU throttling on a MacBook Pro with a completely dead (not recognized) battery?

I have a MBP late 2011 running El Capitan, recently my battery died (x over the icon and "no battery available" in the dropdown.) I've noticed since then that CPU intensive tasks are very slow, and I ...
4
votes
1answer
1k views

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

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 ...
53
votes
9answers
57k 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, ...
6
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 ...
5
votes
1answer
184 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, ...
41
votes
3answers
33k 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,...
10
votes
5answers
32k 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 ...
18
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 ...
6
votes
3answers
21k 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 that ...
15
votes
2answers
20k 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" ...
14
votes
2answers
1k views

How can I verify if Apple is slowing down my phone because of an old battery?

Apple has recently confirmed they're slowing down phones which have a battery that's too old. How can I verify if that's the case for my particular model? Is there an app that can tell me the current "...
8
votes
2answers
713 views

Why is Illustrator throttled to 2% speed when it's in the background?

I regularly run a .jsx script in Adobe Illustrator that saves a bunch of files in a particular format. while Illustrator is the active app, running the script on 5 files takes 23 seconds. When ...
3
votes
1answer
3k 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 ...
28
votes
4answers
5k 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 ...
15
votes
2answers
67k views

Kernel_task using 300% CPU time, high fan speed and slow computer in MacBook Pro [duplicate]

My MacBook Pro has become slow lately. Activity monitor shows kernel task is using around 300% CPU. The fan is always on at high speed. Below are the details of my computer: Macbook Pro 13-inch, Mid ...
13
votes
3answers
9k views

How can I diagnose or fix the CalendarAgent occupying a whole CPU on Mountain Lion?

Since I upgraded to Mountain Lion from Lion I see the CalendarAgent process occupying a large amount of 1 CPU on my late-2008 MacBook Pro. To fix this (as suggested by a Google result) I tried ...
8
votes
8answers
11k 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 ...
5
votes
1answer
33k 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 ...
15
votes
3answers
13k 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 ...
14
votes
6answers
13k views

Alternative activity monitors for OS X?

I’m a bit intrigued by the new detailed activity monitors and progress indicators in Windows 8 (copying files, the task monitor, network activity, etc.) It got me thinking: surely there must be some ...
27
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 ...
21
votes
4answers
565 views

Multi threaded CPU intensive task throttles CPU way before temperatures limits

I have written a very CPU intensive threaded task that works as expected on my 2012 MacBook Pro quad core. I turn it loose with 20 threads and the temperatures get up to about 100 °C as measured with ...
7
votes
2answers
785 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
4k 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 ...
8
votes
5answers
2k views

Does force closing apps have any benefit on iOS devices?

I've gotten mixed answers from various websites and people concerning this question, and I wanted to put it out there for all of you to answer once and for all. The question is, does force closing ...
8
votes
1answer
12k 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 ...
6
votes
2answers
8k 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 ...
5
votes
0answers
255 views

Messages is unusable due to unresponsiveness!

Messages on High Sierra has become increasingly unusable for me. I get frequent (every dozen words or so, at least once per message) long (5-20s) lags when typing — which seem to occur most often when ...
3
votes
3answers
7k 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 ...
15
votes
5answers
24k 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 ...
11
votes
5answers
9k views

How can I simulate having a slow CPU?

I am almost done coding my webapp-game. It runs on all modern browsers. However, I want to establish some minimum requirements for it. Thus, I need a slow Mac. However, I don't have access to a slow ...
6
votes
2answers
9k 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 ...
5
votes
2answers
5k 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
0answers
558 views

AppleSpell error: Contacts change history truncated, resetting!

My macOS High Sierra system is increasingly slowing to a crawl and having huge spikes in CPU usage, notably in Messages, but even when it not running. The logs that seem to be most closely associated ...
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
1answer
2k 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 ...
3
votes
3answers
777 views

Is disk image encryption slower than partition encryption?

I am considering two options to encrypt some data: add a new encrypted partition add an encrypted disk image Which option is faster in terms of disk read/write speed? I suspect that an encrypted ...
3
votes
1answer
88 views

How to prevent Script Editor from scrolling (and losing cursor location) on compile?

I have some lengthy .scpt files. By "lengthy," I'm talking character counts (excluding spaces) of 200,000. I use Script Editor.app to create and edit AppleScripts (simply because Script Editor was ...
2
votes
1answer
254 views

How to decide which is the better browser for me: Google Chrome or Safari? [closed]

Consider that it is often said that... Safari is more battery/CPU efficient. Most people will never run across a web site that runs better on Chrome than on Safari (excluding Google explicit sites). ...