While running a Full system scan KIS uses just under what Nod32 does at idle.
As with most apps that are currently being beta tested it's going to have bugs. That will be fixed before it goes to release I have no doubt.
Kaspersky Internet Suite (AV, Firewall, Ad blocker, Proactive defense, etc, etc, )
Mem usage @ idle-
Avp.exe: 2k
Avp.exe: 3k
Total=5k (roughly)
NOD32 Antivirus (JUST the AV, NO firewall, etc, etc)
Mem usage @ idle-
Nod32krn.exe: 25k
Nod32kui.exe: 3k
Total=28k (roughly)
Anyone who says "NOD32 is the lightest/Fastest" is just regurgitating the marketing gimmic ESET uses to sell their sub-par scanner.