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Jan 3, 2016 7:36 PM in response to amproby macjack,Not recommended because Software updates will not accumulate and make your Mac slow. Many of them contain security patches which are important to your system.
If you really want to, launch MAS and choose the Updates tab. When it finishes checking for updates, right-click on apps on the list to be updated and select, “Hide Update.” Then Notification Center will stop notifications on that particular update.
You could turn off all Software Update in the Software Update pane of System Preferences which would turn off all notifications of updates. IMO, neither is not a good idea.
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Jan 3, 2016 7:37 PM in response to amproby Kappy,Open App Store preferences and turn off automatic updates. You can also change notification preferences using the Notifications preferences.
Updates to not "accumulate" somewhere nor slow down the computer. It is, however, wise to update apps just to keep all your software current. Avoiding software updates is certainly not the best way to keep your Mac running cleanly.
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Avoid using any third-party software that claims to clean up your computer. Usually this software does more bad than good. Furthermore, you don't need it. Note that all computers will become slower over time even under normal use. Experienced users typically erase the hard drive and do a clean install from scratch at least once a year or whenever installing a major OS upgrade. Of course doing so also means you must maintain regular and multiple backups.
Add more RAM or cut back on the number of concurrently running applications and utilities. Remove unnecessary software such as anti-malware and software that promises to clean your Mac. Check for runaway processes: Runaway applications can shorten battery runtime, affect performance, and increase heat and fan acti… Also see:
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, 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.
The Ultimate Fix
Backup everything, erase the drive, reinstall OS X, and restore your data from the backup. Reinstall third-party software from original media/scratch.