Q: How to create new user, with same personal files, for troubleshooting?

You shouldn't do any of that for troubleshooting. The test user account should be pristine. If you copy stuff from the old account, then you also copy whatever is causing a problem.

Just use the Accounts/Users & Groups preferences to create a second user called, "test." Make this user an admin user. Then log out of the old account and log into the new one. That's it. You can still access and use applications in the Applications folder if you need to test third-party applications.

We could be more helpful if you explain just what you need to troubleshoot. If just the spinning beachball is your issue, then visit The XLab FAQs and read the FAQ on resolving the SBOD problem.

If the computer is simply running slowly then read the following:

Things You Can Do To Resolve Slow Downs

If your computer seems to be running slower here are some things you can do:

Start with visits to:     OS X Maintenance - MacAttorney;

                                  The X Lab: The X-FAQs;

                                  The Safe Mac » Mac Performance Guide;

                                  The Safe Mac » The myth of the dirty Mac;

                                  Mac maintenance Quick Assist.

Boot into Safe Mode then repair your hard drive and permissions:

Repair the Hard Drive and Permissions Pre-Lion

Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.

Repair the Hard Drive - Lion/Mountain Lion/Mavericks

Boot to the Recovery HD:

Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilites Menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD disk icon and click on the arrow button below.

When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.

Restart your computer normally and see if this has helped any. Next do some maintenance:

For situations Disk Utility cannot handle the best third-party utility is Disk Warrior;  DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible.

Note: Alsoft ships DW on a bootable DVD that will startup Macs running Snow Leopard or earlier. It cannot start Macs that came with Lion or later pre-installed, however, DW will work on those models.

Suggestions for OS X Maintenance

OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep.  Dependence upon third-party utilities to run the periodic maintenance scripts was significantly reduced since Tiger.  These utilities have limited or no functionality with Snow Leopard or later and should not be installed.

OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive.

Helpful Links Regarding Malware Protection

An excellent link to read is Tom Reed's Mac Malware Guide.

Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.

See these Apple articles:

          Mac OS X Snow Leopard and malware detection

          OS X Lion- Protect your Mac from malware

          OS X Mountain Lion- Protect your Mac from malware

          About file quarantine in OS X

If you require anti-virus protection I recommend using VirusBarrier Express 1.1.6 or Dr.Web Light both from the App Store. They're both free, and since they're from the App Store, they won't destabilize the system. (Thank you to Thomas Reed for these recommendations.)

Troubleshooting Applications

I recommend downloading a utility such as TinkerTool System, OnyX, Mavericks Cache Cleaner, or Cocktail that you can use for removing old log files and archives, clearing caches, etc. Corrupted cache, log, or temporary files can cause application or OS X crashes as well as kernel panics.

If you have Snow Leopard or Leopard, then for similar repairs install the freeware utility Applejack.  If you cannot start up in OS X, you may be able to start in single-user mode from which you can run Applejack to do a whole set of repair and maintenance routines from the command line.  Note that AppleJack 1.5 is required for Leopard. AppleJack 1.6 is compatible with Snow Leopard. Applejack does not work with Lion and later.

Basic Backup

For some people Time Machine will be more than adequate. Time Machine is part of OS X. There are two components:

1. A Time Machine preferences panel as part of System Preferences;

2. A Time Machine application located in the Applications folder. It is

    used to manage backups and to restore backups. Time Machine

    requires a backup drive that is at least twice the capacity of the

    drive being backed up.

Alternatively, get an external drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):

  1. Carbon Copy Cloner

  2. Get Backup

  3. Deja Vu

  4. SuperDuper!

  5. Synk Pro

  6. Tri-Backup

Visit The XLab FAQs and read the FAQ on backup and restore.  Also read How to Back Up and Restore Your Files. For help with using Time Machine visit Pondini's Time Machine FAQ for help with all things Time Machine.

Referenced software can be found at MacUpdate.

Additional Hints

Be sure you have an adequate amount of RAM installed for the number of applications you run concurrently. Be sure you leave a minimum of 10% of the hard drive's capacity as free space.

Add more RAM. If your computer has less than 2 GBs of RAM and you are using OS X Leopard or later, then you can do with more RAM. Snow Leopard and Lion work much better with 4 GBs of RAM than their system minimums. The more concurrent applications you tend to use the more RAM you should have.

Always maintain at least 15 GBs or 10% of your hard drive's capacity as free space, whichever is greater. OS X is frequently accessing your hard drive, so providing adequate free space will keep things from slowing down.

Check for applications that may be hogging the CPU:

Pre-Mavericks

Open Activity Monitor in the Utilities folder.  Select All Processes from the Processes dropdown menu.  Click twice on the CPU% column header to display in descending order.  If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar.  Click on the Force Quit button to kill the process.  See if that helps.  Be sure to note the name of the runaway process so you can track down the cause of the problem.

Mavericks and later

Open Activity Monitor in the Utilities folder.  Select All Processes from the View menu.  Click on the CPU tab in the toolbar. Click twice on the CPU% column header to display in descending order.  If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar.  Click on the Force Quit button to kill the process.  See if that helps.  Be sure to note the name of the runaway process so you can track down the cause of the problem.

Often this problem occurs because of a corrupted cache or preferences file or an attempt to write to a corrupted log file.

If it is pretty much exclusive to browers, then use only one browser, Safari. To start fresh try resetting the browser - under the Safari menu. Clear out all history, related cache files and preference files.

Be sure everything in use on the computer is up to date. Repair the hard drive and permissions.

The point to booting into a different user account is to determine if the problem you have is being caused by something in the user's normal account. If it is, then the problem will not be present in a new user account.

To test if the problem is in certain system related files boot the computer into Safe Mode to see if the problem disappears. With Snow Leopard, however, Wi-Fi will not work in safe mode. Use Ethernet instead.

BTW, you cannot repair a startup drive. You must boot from another drive, so what you see is actually normal, not abnormal. What would be abnormal is if the hard drive does not appear in Disk Utility's sidebar.

Applejack is a useful tool, but only for Snow Leopard or earlier.

How large is your HD & how much space do you have left?

You can always verify a volume. Be sure you are verifying the volume (sub-entry of the drive entry) and not the main drive entry.

Ethernet is for the Internet. BT is for the keyboard. If the keyboard does not work, then you will need a USB keyboard temporarily.

I'm not sure why it matters whether Safari is the number one browser for javascript. It works, and works typically as well as any other browser. It's also native to OS X which means less likely to cause a problem.

My personal advice is this. You will waste far more time trying to determine what the problem(s) is and how to solve it than the time it takes to erase the drive and reinstall OS X from scratch. Then carefully reinstall any third-party software after being sure they are updated for Snow Leopard compatibility (if you will be installing Snow Leopard.)