I don’t know the specific answer to your question, but Strapi can be containerized fairly easily. Node in general scales pretty well. GETs are as snappy as you’d expect them to be in any Node framework (it uses Koa). It doesn’t require external chaching mechanisms like memcached or redis, and it pools databse connections nicely. Of course, most of that comes from the underlying tech they build Strapi with.
I think the hardest ops thing you’re going to need to manage is database scaling. Postgres is of course the right pick, but how you scale that is up to you.