There was SubgraphOS which used namespaces, but it seems pretty dead.
Qubes is the best and most currently complete thing i've seen (In the last couple years its also made progress supporting GPU domain). Its not perfect and has some controversial opinions like default passwordless sudo in VMs, but it is still far ahead of most distro's security.
For me Qubes 4.1 performs well though I have it on an m.2 and have plenty of ram. It boots quickly, with the only seriously slow thing being VM startup. I'm able to do all my dev work and use Windows for work related things on it as well as have disposable browsers for banking and sketchy sites.
> There was SubgraphOS which used namespaces, but it seems pretty dead.
Knowing nothing more than what you've just told me: That doesn't sound like a bad thing, IMO; if you're using that kind of system, you probably care a lot about security, and I'm not sure I'd trust a shared-kernel system against malicious code. (I appreciate that other people may make that trade-off very differently)
Qubes is the best and most currently complete thing i've seen (In the last couple years its also made progress supporting GPU domain). Its not perfect and has some controversial opinions like default passwordless sudo in VMs, but it is still far ahead of most distro's security.
For me Qubes 4.1 performs well though I have it on an m.2 and have plenty of ram. It boots quickly, with the only seriously slow thing being VM startup. I'm able to do all my dev work and use Windows for work related things on it as well as have disposable browsers for banking and sketchy sites.