Spec of My Home Server running this instance is.
N40L 2core/1.5GHz
Athlon 220GE
MEM:16GB HDD:250GB + 1TB x 2
MEM:16GB NVMe SSD:250GB + SSD 1TB x 2
Mastodon on Virtualbox vCPU:2 vMEM:4GB vHDD:200GB
Mastodon on Virtualbox vCPU:4 vMEM:4GB vHDD:200GB
Ruby2.6, Node10, nginx1.15, PostgreSQL10...
Ruby2.6, Node10, nginx1.17.x, PostgreSQL10...

My home server paw since Jul/2003