Modern antivirus software can run without you noticing it at all. And then, are you sure you will not forget to turn the antivirus back on after you are done gaming? If your computer does get infected, that is when the lag, not to mention other troubles, begins. Lots of malicious programs are after Steam accounts - not to mention, it is really easy to download something nasty to an unprotected device. Every once in a while, you’ll see someone in an in-game chat complaining that their favorite shooter keeps lagging, to which someone else responds with the usual pearl of wisdom: Turn off your antivirus. Some gamers have little love for antivirus programs.
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