Does no lag VPN Work?

If it has routing issues or is throttling gaming traffic then you could see some speed gains. But ultimately, no VPN can automatically increase your connection speeds and reduce lag - no matter what next gen routing its developed - and youre more likely to see some slowdown.

Can you 1v1 in Cold War?

Players can either sign into a second PSN or Xbox Live account, or use a Guest account. Note, the latter option only allows for local play, 1v1. In addition to split-screen support, Call of Duty: Black Ops Cold War allows players to choose between a vertical and horizontal set-up.