Yup, this is what I like about Docker (I'm sure there's some overhead as well), application isolation with out paying for it seriously in terms of performance.

Yup, this is what I like about Docker (I'm sure there's some overhead as well), application isolation with out paying for it seriously in terms of performance. That said you can pull a lot of performance out of a modern 2U server, 24 cores and 256 GB of RAM can be had pretty cheaply these days, pair it with 8 SSDs and you've got a real workhorse. Even a traditional MySQL/Postgresql DB can maintain upwards of 140,000 tps on hardware like that.