I've been looking for this test for a while
I installed avira on my gf's laptop for a week and it was extremely buggy: unacceptable memory usage (1.3Gb memory = 99% physical ram usage and 100% pagefile usage) after playing The Sims 4, her laptop was super laggy even after 1 hour of doing nothing -> immediately switched to avast and it was stable then
IMO, avira is only good for a weak, old, mostly offline or deepfreeze-d users (internet cafe) because of it's great offline signature detection. avira is very light on an uninfected system but it becomes heavy after some malware attacks