How to Troubleshoot iMac Performance
Under normal conditions, the Apple iMac computer is fully capable of handling everyday computer use. However, if your iMac's performance level has decreased, it can affect your ability to use the applications on the computer productively. The decrease in performance can be the result of problems with the Mac OS X operating system or applications installed on the system. Troubleshoot these issues by using iMac's utilities.
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Instructions
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Close all open applications that you are not using. Running multiple applications simultaneously can put a strain on the iMac's processor and cause the computer to operate slower than usual.
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Update your iMac. Click the "Apple" icon in the desktop's menu bar, then select "Software Update." Click the check box next to each item on the list of updates, then click the "Install" button. Enter you administrator login information when prompted. The System automatically installs the updates on your iMac.
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Run the disk utility on your iMac. The disk utility checks the disk to detect and repair any problems that may be causing the decline in your iMac's performance. Open the "Applications" folder, select the "Utilities" folder and "Disk Utility," then click on the drive in your iMac that you want to check. Click the "First Aid" tab, then click "Verify Disk." If the utility displays any issues, click "Repair Disk Permissions" to fix them.
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Reset your iMac's PRAM. The PRAM is a small amount of random access memory on your iMac that stores specific settings, such as the display's refresh rate. If the PRAM becomes corrupted, it can cause your iMac to have performance issues. Turn off your iMac. Turn it back on and immediately press the "Command," "Option," "P" and "R" keys simultaneously and hold them. Release the keys after you hear the startup sounds twice. The PRAM automatically resets.
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References
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