For the GC it sounds like they don’t have generations which means copying long-lived objects needlessly due to the generational hypothesis. Interesting idea with the mailbox allocator, but how do these two allocators interact? Is the heap non-regional, or are they allocating into separate regions?
But they only collect tiny actors spaces, no big consecutive heaps as usual. Anyway, you can always add a minor collection later, and benchmark it. She didn't write it, a friend did.
