With our old Symantec Corp 9 real-time scanning was resource-friendly and most people didn't notice it at all. With NOD32 4.0.474 It's utterly unbearable. I just installed a video conversion package on a workstation here. I installed the same package on another machine a few days ago and don't remember how long it took to install but it was certainly no longer than 60 seconds and the system was responsive throughout. That was with Symantec Corp 9 installed. I just sat here watching it bring the system to its knees. It's an XP system with 2GB ram and a 2Ghz dual core. Not exactly a supercomputer but certainly more than fast enough for most tasks these days. How long did it take with NOD32 installed? 13 minutes from start to finish. 13 minutes! During which the system was utterly unresponsive. I'm talking taking 45 seconds to bring up the task manager with every open application displaying "Not Responding" in the title bar. When Task Manager finally came up ekrn.exe was at 99% CPU throughout the installation. Opening an excel file from the network used to take a second or two with our old AV. Opening the same files now takes around 5 seconds. Attached is a shot of my settings - they're the defaults. Before I turn off the real-time scanning is there anything I should be tweaking? The documentation is less than useful on this matter.