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?

You can make your communication more professional by spelling out initialisms the first time you use them and then following them with the initialism in brackets. Like this: garbage collector (GC). After that, you may use the initialism freely.

Sincerely, your bad initialism GC.