@ orainsear.
The program file itself takes some 154 Mgbs of space.
There are two associated running processes.
AvastUI.exe............which runs at 5700 kbs
and
AvastSvc.exe............."At rest" with just the real time "file system shield" and the "behaviour shield" running this clocks about 21252 kbs. When scanning, this rises to 25248 kbs.
The only other shield I have running is the "web shield" which runs (of course) only when my browser is open when this service goes to about 27454 kbs.
The networking, ptop and instant message I have turned off...don't indulge with these things.
I have as yet not been quick enough to establish RAM usage during auto-update..
That's on XP Sp2 .