It's a completely unscientific method, but searching through one of our large applications (`npm ls|wc -l` -> ~2000 dependencies), the only modules I can find using `uv_queue_work` are:

* kerberos, unused (dependency of mongodb)

* protobuf, for serializing data

* snappy, for compression

kerberos isn't actually used in our app, so it doesn't matter, but we send a lot of data through protobuf and snappy, so it may be worth us profiling this a little more.