New iMac with El Capitan gel

I bought a new iMac 21.5 3 months ago, with an upgrade to 16 GB of RAM.  Within the first week, he started to run slowly and kept freezing.  It got worse as the weeks went by.  I got to my local Apple store where a diagnostic equipment is made, no defect found.  The Genius Bar offers a complete re-installation of software, which has been done.  The iMac continues occasionally to run slowly when on the Internet with Safari (it is better to use Firefox) and freeze until almost every day, the only way to make it work again is to turn it off and on again, by using the power button.  For the record - I have not downloaded any software Mac cleaning or similar, or any other software/applications that have been suggested elsewhere that can cause this problem.

Has anyone else had this problem and found a solution?  After 20 years of using Mac, I'm about to take this iMac back for a full refund, after losing confidence in this particular product.  I have to say that all my previous iMac has worked flawlessly.

I am convinced that el Capitan is the problem.

Matchless350 wrote:

The iMac continues occasionally to run slowly when on the Internet with Safari (it is better to use Firefox) and freeze until almost every day, the only way to make it work again is to turn it off and on again, by using the power button.

1. Disable Extensions and test them.

Safari > Preferences > Extensions

Uncheck 'Enable the Extension' and test.

Enable the Extensions one by one and test.

To uninstall any extension, select it and click the "Uninstall" button

2 remove the test and com.apple.Safari.plist file.

Empty the trash.

Quit all applications.

Hold down the option key and click on the "Go" menu in the Finder menu bar.

Select 'Library' in the menu dropdown.

Library > Preferences > com.apple.Safari.plist

Right-click on it and select "place it in the trash.

Close the Finder window.

Turn it back on.    Restart Safari.

If this does not help, "put back" the com.apple.Safari.plist

Right click on the trash icon in the Dock, then select 'open '.

Right-click on the com.apple.Safari.plist and select 'Put Back'.

Tags: Mac OS & System Software

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