Hardware requirement, selfhosting dedicated gateway

I host i2p on a rpi 3 in order to use it as a mutualize gateway for my private network. i2p consume so much ressources that I couldn't even curl it's web interfaces. It try to get some info on what are the hardware requirements, but didn't find anything.

• What are the minimal hardware requirements for the current version of i2p ?
• Is it a good idea to mutualise a gateway on a private server ?
• If so, is it a good idea to give access to this gateway through a VPN ?

Thanks for your answers