[英文轉載]17個原因為何你的mac越來越慢

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source:http://www.chriswrites.com/2009/ ... ably-slow/#comments

17 Reasons Why Your Mac Runs Slower Than it Should

Day by day, bit by bit your Mac has got slower and slower. You don’t really notice because it has happened so gradually.

Until one day you have a chance to use another machine, that’s when you realize what your beloved Mac has become, as slow as an asthmatic ant carrying some heavy shopping.

Well all is not lost, while this list is unlikely to make you mac into a speed demon overnight, one of the following suggestions may just help.

Cluttered Desktop
Having too many files and folders on your desktop can slowdown your machine. Put these files into folders in your home directory and create aliases to them on the desktop.


Corrupt Preference Files
Preference files can easily become corrupt and can make programs act weird or run slowly. If your Mac is slow using a particular application you can try deleting its preference file and relaunching he app (applications create a new file when they are relaunched if they can’t find an existing one). It’s worth making a backup of the old file just i case you lose some settings that are hard to replicate.


Smart Playlists on iTunes
Smart playlists can make iTunes  slower as they have to reload  every time iTunes is launched. Disable live updating by going to File, Edit Smart Playlist and untick Live Updating.

Too Many Widgets on Dashboard
Each Widget on your Dashboard uses memory, again you can check the memory usage of your widgets by using the Activity Monitor. Remove any used or memory hogging widgets using the Dashboard control panel.


Caches, Log files and Temporary Items
It doesn’t hurt to regularly clear out built up Caches, Log files and Temporary Items an easy way to do this is to use an application like MacKeeper. If you prefer you can delete Caches manually, they can be found in Home/Library/Cache.

Wrong Firmware
Using the wrong Firmware can cause all sorts of problems, keeping your software up to date on a Mac is so easy there is really no excuse. Just click on Software Update in the Apple menu. You can also schedule your Mac to automatically check for updates, go to System Preferences and Software Update and tick Check for updates. You can change the frequency of the checks using the drop down menu.


Not Enough RAM
Software can only take you so far. Upgrading your RAM will probably give you the biggest speed increase out of any of these tips. You can use the Activity Monitor application (under Utilities in the Application folder) to check if your Mac would benefit from more RAM. Click on System Memory tab and have a look at the pie chart at the bottom. If the chart is largely red or orange you are running out of RAM. Also take a look at the Page Ins and Outs numbers, if these are continually increasing, its time to upgrade your RAM.


Permission Conflicts
Some issues with applications loading slowly or acting weird can be remedied by repairing permissions. All files in Mac Os X have a set of permissions, these determine which users or applications can have access to them. Sometimes permissions are incorrect and not what the operating system expects. To repair disk permissions you can use the Disk Utility app (in /Applications/Utilities). Select your startup disk and click th First Aid tab, then click the Repair Disk Permissions button.



Hard Disk Is Nearly Full
Your Mac automatically utilizes free space on your Hard drive as Virtual Memory to free up the RAM.  Try to make sure you have 10% free space available for this task.

Lots of Login Items
Removing unwanted or little used programs from your login items. To change your login items go to System Preferences then Accounts and click the Login Items tab.


Unused System Preference Panes
Clearing out unused preference panes can help free up memory and disk space, check under Other in System Preferences to see what you can remove. You can either disable it in its menu or delete it entirely by removing it from ~/Library/PreferencePanes.

Unused Applications Left Running
All running applications use up your memory and CPU resources, quit applications if you are not going to use them for a while. Some programs have memory leakage issues which means they tend to consume more and more memory the longer they are running (again you can spot these in the Activity Monitor) it a a good idea to quit and relaunch these every so often.


Animated Wallpapers
Animated or slide show wallpaper can really impact the performance of your machine so its a good idea to turn this off.

Firefox Overloaded With Extensions
There are loads of awesome Firefox extensions so its easy to get carried away and add too many. Take a few moments to go through your Add-ons (open Firefox and go to tools then Add-ons) and uninstall any you no longer use.


Internet Settings
If you are finding your browser slow try clearing the cache and deleting your history. In Safari you do this by going to the main menu and clicking Reset Safari, tick Clear History and Empty the Cache then Reset. In Firefox go to Preferences, Privacy and click the Clear Now button.
Favicons in Safari or Firefox
You may see an improvement in your browsers performance by deleting your cached Favicons, for Safari just delete the files in /Library/Safari/Icons.  If you use Firefox 3 read this useful tutorial on macosxhints.

Massive Mailboxes
If you have a massive mailbox with thousands of messages it’s going to take longer to load. Try to delete messages you no longer need and split larger mailboxes into folders.

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source: http://www.lifeisaprayer.com/articles/computing/mac-running-slow



Every Mac user should make sure he runs three basic maintenance tasks:

    'Cron' scripts: Mac OS X is a UNIX operating system, and there are 'cron' scripts that clean up messy log files, optimize certain parts of the system, and accounts for user activity. There are three tasks - one that should be run daily, one weekly and one monthly. Anacron, OnyX, and Macaroni perform this task, but with newer Macs running 10.5 'Leopard' or later, this is no longer necessary to be run manually—your Mac takes care of it.
    Optimize Prebindings: Every time you install an application in Mac OS X, the installer will finish the installation by 'optimizing your system;' this is a fancy name for optimizing prebindings. Doing so will speed up application start times and keep things running smoothly. Macaroni does this.
    Repair Permissions: Because Mac OS X allows multiple user accounts, and because OS X has UNIX underpinnings, file 'permissions' can become messed up sometimes, especially if you have many different users on your computer, and they use the same programs. Sometimes, really weird things can happen as a result of your permissions being messed up, and this can also slow down your computer. OnyX, Macaroni and Disk Utility perform this task.

One last thing you can do that will not necessarily speed up your Mac, but will free up a considerable amount of hard drive space, is to erase the thousands of foreign language files that are installed with every application and utility on your computer. Sometimes, this can free up more than a gigabyte of hard drive space! Use Monolingual to do this.

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OnyX is another free utility for running regular maintenance, although you must manually run this program's routines once a week or month (depending on your computer usage). One good thing about this utility, though, is that you can perform all the maintenance routines you'd need with one click in the Automation tab; after you do this, restart your Mac and see if everything's better.

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Macaroni costs less than $10, but allows you to run all the necessary maintenance tasks automatically; it's kind of like combining both Anacron and OnyX, but Macaroni is easier to configure and use than both, and will make sure all the important maintenance tasks are run when the should be.

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Monolingual is a free utility that allows you to delete unused 'localization' files—files that allow your Mac to operate in many different languages; if you only live in one country and speak one language, you can free up a lot of hard drive space (sometimes more than 1 GB!) by deleting languages you don't use. Macaroni also performs this task.

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Disk Utility comes installed on Mac OS 10.3 or later, and allows you to verify your hard disk or repair permissions by clicking on your hard drive and then clicking on the "Repair Disk Permissions" button.