Eh, nah it looks like `heed` (the LMDB library) isn't async so I couldn't do it if I wanted to. Data access is memory-mapped, and any delays happen in the kernel (I think) and are kind-of hidden to the application (kernel handles the page fault, our code is put to sleep while that happens), so hard to async in userspace in this case, but it should be fast nonetheless. Potentially a thread sleeps over a page fault when the CPU could have otherwise been busy, but probably not something we can fix.

All network waits are definately async futures.