avast! and NTFS LastAccess function

Some time ago i heard something about scan speed optimizations using NTFS LastAccess tag.
So does it have to be enabled or can i disable it?
I’m asking because i’m working on some Windows tweaker and i don’t want to break avast! scan speed with it (allthough disabling of LastAccess tagging helps to speed up filesystem a bit)

As far as I know, avast! doesn’t use the LastAccess time for anything. It tries to keep it unchanged during scanning, but that’s all.
So, unless Vlk states differently, I’d say it shouldn’t have any effect on avast! scanning.

I turned it off some months ago and I have not noticed any effect on my regular scans.