While working with latest Avast! beta build (1038)
TaskManager Memory Usage / Peak MU
ashDisp.exe 6625K - 28612K
ashMaiSv.exe 820K - 19568K
ashServ.exe 17496K - 49212K
ashWebSv.exe 528K - 17640K
ashUpdSv.exe 256K - 2160K
Process Explorer Private Bytes / Peak PB, Working Set, Peak WS
ashDisp.exe 3252K - 17124K , 6660K - 28612K
ashMaiSv.exe 3860K - 9736K , 2364K - 19568K
ashServ.exe 25040K - 29944K , 17816K - 49212K
ashWebSv.exe 14628K - 19372K , 528K - 17640K
ashUpdSv.exe 872K - 872K , 340K - 2160K
it may be bit higher than usual,
but this is with everything set high and active ...
only coders from Alwil may answer if there is any chance to lower memory usage w/o sacrify something elsewhere ...
btw. while working with memory hungry application (1.5GB+ memory sucked in second) all Avast! processes in memory dropped to less than 1MB each