Intermittent Safari Lock-up; Firefox is not

Info: iMAc (20-inch, easy 2008), 2.66 GHz Intel Core 2 Duo, 4 GB, ATI Radeon HD 2600 Pro 256 MB.  Disk 320 GB SATA with two partitions"Mac HD and Bootcamp (this space is not used).  There is a free space of about 120 GB.

Software: OSX El Capitan 10.11.4, Safari 9.1 (the only Extension is DuckDuckGo; Plug - ins are for Adobe Acrobat, iPhoto Photocast and Shockwave Flash), Firefox 45.0.1 (no Extensions; Plug - ins for Adobe Acrobat and Shockwave Flash video Codec OpenH264 1.5.3), Opera 36.0.2130.46, Flash Player NPAPI plugin Ver 21.0.0.197 and PPAPI plugin Ver 21.0.0.197, Adobe Reader 11.0.15.

The problem with Safari started, at first, when I try to scroll forward one page had fully loaded.  Experimenting with it, I wait until a page was loaded, and then scroll down.  Early on, no problem.  However, over time, the problem worsened.  System would begin behind closed doors.  Sometimes, if I noticed a slowdown in performance, I would move the mouse back and forth as fast as I could.  Could be a coincidence, but this does not prevent the camera.  However, subsequently there and a power down was necessary.

Due to the age of my system, I was wondering if it would be a hardware problem.  Before taking this step, I thought I would try Firefox.  Not only the pages load more quickly, at the approximate rate which is used to make Safari, there is no detention.  (Note, however, there are 'crashes', from time to time, even if they do not prevent me to continue to use Firefox without taking certain measures, including closing and re-opening).

For a few weeks, I have variously reset NVRAM, reset the SMC and double checked that my software is up to date.  I got SOPHOS on the system.  However, it has been uninstalled.  More recently, I did a Combo update of OS X El Capitan 10.11.4.  My solution for the current time is mainly use Firefox.

VALman-

Do you have any antivirus, security or cleaning apps out there?

Norton, McAfee, Intego... CleanMyMac?   Not at all?

Tags: Mac OS & System Software

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