[ElatedOwl]

load_async is still concurrency, but not parallelism. The queries themselves can run parallel, but when materializing AR objects e.g., only one thread can run at a time. A greedy thread in process will still subject you to GVL waits

[Lio]

If that’s a problem for you right now I’d suggest giving JRuby a look as it has no GVL and true multithreading.

Hopefully as Ractors mature that problem will be solved for MRI too.