I saw something

I saw someone on YouTube running this exchange with 2gb of ram or less and it works fine . I have a question to ask

Can I buy a domain name and link it to the “VPS” I am using for the Rubykube?

If only hosting Ethereum tokens does it still need/involve the use of “High Sever” VPS.

If I optimize or cache my Linux will it boost the speed of loading the website .