[internetionals]

Since refcounting only happens expicitly it should be pretty clear where possible drops happen that lead to large pauses.

It wouldn't be too hard to replace that Rc with an Rc that performs deferred drops by putting them in a queue and performing a number of drops at an oppurtune time (eg. using an idle-hook in a event loop).

It might even be possible to send all drops to a thread dedicated to dropping, but that would probably only work if the contents are Sync or Send. This form of async drops should always be possible for Arc.

But big pauses should rarely occur since refcounting is something that has to be added explicitly, Rust is a language where compound types are used extensively instead of building dynamic structures using collections for trivial things and the use of Drop trait is not something that can be fully relief upon (making that most solutions try to go without using it). This should make most drops pretty lightweight, even when dropping large numbers of items.