Antiviruses really cripple down your computer performance. I avoided using antivirus just by using a firewall and avoiding opening any shared files. If I need

Antiviruses really cripple down your computer performance. I avoided using antivirus just by using a firewall and avoiding opening any shared files. If I need to open a document, I will upload it to some online office suite and read it there. If I receive some potentially malicious email I will read the message source and verify it's legit. I also don't use Windows anymore, but when I did, this strategy worked well for me.