I imagine you'll hear someone recommend most products on the market.
😉
I'm very happy with the current (and last couple of years) versions of Norton Internet Security / Norton 360. Very little system impact, even on an ancient laptop. A plus of Norton 360 is that it also includes some (optional) tune-up utilities to regularly empty out the temporary file folder, can clean up orphaned registry entries, schedule disk defragmentation and a bunch of other stuff. Has a cool start-up manager that is better than editing Windows startup file - as it lets you disable startup items you don't need at all, but delay by some minutes the launching of startup items that are helpful but not essential - making your Windows computer restart to a usable state much faster than otherwise.
One weird Norton thing is that its Live Update feature only downloads updates for the current product. But, every user is entitled to a free upgrade to the current product during their 366 day license period. For some reason, this is a manual step that I'll bet a lot of people don't know is available. Click Support > Check for New Version to get the download link.
3-license packs are often on sale, making them a good value. (I got one for $20 recently) ... but note that while you can install on 3 computers ... the license expires 366 days after the FIRST installation ... so putting a copy on another computer 6 months in to your license period only gives you 6 months coverage on that computer.
Cheers,
Karl
PS There was a time when the Norton products were big resource hogs. Tried MacAffe at the time and found they were piggish too - both memory and CPU. Back then, Norton would often hang up with Live Update failures that required time consuming troubleshooting and uninstallation / reinstallation. I've not had any of those issues in years now.
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AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB