system
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Well if you want 2.4 meg updates - Avast! could remove incremental updating :o
2.4 meg updates is why i quit using Antivir - i.e. Antivir replaces all defs with each update - making that the most inefficient
and antiquated updater known to mankind.
Also - realize that as far as I know Antivir still does not support runtime unpackers (upx etc.) So where Antivir may have to release a signature for each new runtime packed “virusx” - Avast! may not have to.
My point - you are not comparing apples to apples 