I have used avast in the past before using avg so i can see they have improved but not so much with the ever-evolving malware families (unlike AVG, which is improving greatly).
I was using the free version, so i couldn't complain much, but i always found it to use too much memory that sometimes it made my windows crawl.
Still, with all this aside, good test, avast performance was between medium - medium high, which is good but not great.
Thanks for video.