In addition to Python features, Stackless also adds support for coroutines, communication channels, and task serialization.

Although microthreads make it easier to deal with running subtasks on a single core, Stackless Python does not remove CPython's global interpreter lock (GIL), nor does it use multiple threads and/or processes.

To use multiple CPU cores, one would still need to build an interprocess communication system on top of Stackless Python processes.

The majority of Stackless's features have also been implemented in PyPy, a self-hosting Python interpreter and JIT compiler.

[4] Although the whole Stackless is a separate distribution, its switching functionality has been successfully packaged as a CPython extension called greenlet.