Technology Summary. Users of Symantec (or Norton) antivirus software, such as Endpoint Security or Internet Security suite, on Apple or Windows computers may notice a slowness when trying to perform data intensive tasks, such as system backups. This can also be an issue with McAfee, Trend Micro, and Computer Associates software. Solutions are provided below… Continue reading Solution for Symantec Endpoint Internet Security or Norton AntiVirus Slowing Down Apple or Windows Computer