Kaspersky has been tested as the second lightest after K7. Performance Test April 2020 | AV-Comparatives (Scroll half way down the page) And Kaspersky always scores near the top at about 100% detection.I have been using Bitdefender Total Security for nearly a year now. I actually love it, I felt that Bitdefender is lighter than Kaspersky. I have never compared them but in my personal option (or just a gut feeling) Bitdefender is superior. It blocks all sketchy-looking websites and even sometimes when I make a google image search it shows bad URL blocked notification without any visible disturbance to the search.
I don't know why but Kaspersky takes longer to load up its control panel when I open it
Just like i said Windows defender on Windows 10 is just goodIf you have windows 10 I would recommend using the included "Windows Defender" program as it is good enough for most users. However, if you want even more security, I would have used "Bitdefender", one of the best antivirus programs on the market.