For me it is using about 153 MB when I am having my web browser open. Maybe it will use even less when it is closed. So personally I think it is pretty light compared to some other AVs, also it only has 2 processes it seems compared to others that have something like 6. I would rather it use more RAM than CPU, or Disk which would slow down the computer a lot more than RAM. I know some AV's that use over 200 MB
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Anyway, I have been happy with NANO AV so far, so I don't see myself removing it anytime soon. But overall everyone has their different opinions.