Used to use a Raspberry Pi before I got fibre which acted as a router/gateway for my home network - when the speed increased 10 fold the Pi was unable to keep up.
I saw a post on here about the Odroid and it looks as if it may be able to handle the faster connection and this is the sort of place where someone has already tried it I'm sure.
Also a VPN via the Rpi seemed horribly slow.