//Windows Defender tends not to score well in independent tests. Further it can seriously reduce a computer's performance while its regular updates are being downloaded and installed //
I have never had a Defender update yet, on two machines, that took more than a few minutes. Unlike system upgrades no re-boot is ever required. I have honestly tried all the security systems that have been touted on here including Scanguard. I would not entertain 3rd party security systems they all end up devouring your system capability and even more seriously your time. The best security you have is installed if you use it. Your common sense. "Independent tests" haha. Who's zoomin who? Get your system capabilities up to scratch ensure you have good broadband capabilities and use your head. Spend the dosh on your system. I now do everything online including banking, utility services, water, car tax, tv & fishing licences, etc. etc. saves me hours, and I trust Defender because I take some responsibility for myself.