I'm talking about consumer/home systems.
Uptime doesn't have to be a bad thing on any OS.
The question is if there is a need to keep a system up and running for multiple days.
In the "old days" there sometimes was, if you where downloading something for example.
Even a small picture took quit some time on 1200 baud
It was not removed in the latest beta, but in the first beta after the 2016.12.1.2262 release.
https://forum.avast.com/index.php?topic=186192.0To say it simple, NG runs every application in its own virtual environment.
That is if the hardware supports it and it is enabled in the bios.
Depending on the (amount of) applications you are running, 9% isn't really that bad at all as you could say.
And as I said...
If you don't want to use it you can disable it in the avast settings.