system
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Avast has a very very low resource demand, exspecialy compared to McAfee and Nortan, i have a 450 MHZ CPU and 256 ram and avast set to high and i don’t notice a thing.
Before this i used a 200 MHZ CPU and 128 RAM and i still didn’t notice a difference when avast was turned to high.
So i would say that you are fine with the resource usage from avast!
EDIT: Sorry nearly forgot to Welcome you.
Welcome to the Avast forums merf
–Lee