I think that the issue here will be that JS is single threaded, and using a database to deal with all the queries etc will be the bottle neck.
I used to work for a big company that had the same issue though this was V3 and we changed to Postgres from Mongo etc, and it did speed things up.
But we also required to have more pods to scale up the amount of work done. This also connected to multiple databases in sync to try serve things better.
Though I think sadly saying it’s a JS issue rather then strapi due been single threaded.