I've just pushed C implementation of asyncio.Future .
It will be included in Python 3.6b2.
It may have rough edge. But I hope it will be battle tested
before Python 3.6.0.
Please help us by running your tests on Python 3.6b2, and
report issues you found.
If you have asyncio based project, and it uses Travis-CI,
please add "nightly" to your .travis.cnf .
Feedback about performance difference is also welcome.