Does hardware assisted virtualization eat additional cpu resources if enabled in Avast settings? (it’s enabled in bios)
Does it have some known issues for example for gaming?
Thanks!
It is slighty using some more resources, but you should not notice the difference.
It is like is walking 10km or 10km+1cm.
Is there a difference?
Sure, but you will not notice it 
So far I haven’t seen any reports of issues.
If you (your system) will experience any issues…
Only one way to find out, try it.