Hmm, just to see for myself I uninstalled Norton and installed "Eset Smart Security 4". Better known as Nod32.
Sad to see it's still the same resource hog it always was.
You can chose smart scan and advanced scan.
Turns out there's nothing smart about smartscan.
After 1 hour it was on 20% and according to the log, it had scanned 638mb of files. Most of them were in one folder.
Same as five years ago there were numerous files Nod still can't open and therefor ignores.
Norton does my whole C: drive in under 30 minutes.
And a next time, it will only scan changed files, and finishes in 9 or 10 minutes.
And you will hardly notice it's doing it's work, that's what I call smartscan.
While scanning, Nod32 rendered my pc useless by taking up 90% to 100% of the CPU. See my screenie.
Norton may have missed two "wilds" in the VB test, but it is a far more sophisticated product than the piece of junk Nod still is.
The only thing Eset seems to have updated since the last time I used it, are the virus definitions and they do that well, but for the rest it is a remnant of the early XP days.
If I stepped on some Nod fan's toes I'm sorry
I had high hopes after some positive comments here, but it was a big disappointment.
Second image is only to show footprint. I already stopped scanning.