@minegroasprilla: Considering that third party engine have bind with limitations in such respect to the competitors, although protection can guarantee to maximum level however response time will be differ from actual product.
Can only give you results for QTS360, sorry. It is the current stable v. 8.2.0.1098, with maxed out settings (Security preset). I compare cloud only (custom Security preset, compare Hub) and Avira+BD engine added here.
Yes, but not really noticeable with 4 GB of RAM (not sure about 2, but my mums old Laptop seems to run faster as with Avira Free, BD IS 2015 or Avast Free). There are tons of other processes running in Win10 by default (clean, I have next to nothing in autostart or running regularly).