I had an old version of Norton on my older, desktop computer. Yeah, it hogged resources, but the scans were still fast. I got a really new version for my new laptop, and it doesn't hog resources AND it still scans fast. I think all the haters out there are taking facts from versions from years ago and using them to look cool like the rest of the people hating Norton.
Norton is really good, you just need to try a newer version.