From years of experience dealing with "slow Windows machine" complaints for family, I can tell you that in 2019 the builtin Windows antivirus is much better (pe

From years of experience dealing with "slow Windows machine" complaints for family, I can tell you that in 2019 the builtin Windows antivirus is much better (performance + security wise) than any of the free services. Uninstalling Avira (and especially crap like CCleaner) will probably improve performance on its own.