Jimmy Lai <yuri...@gmail.com> added the comment:

@pitrou This change is part of optimization for asyncio.gather().
gather -> ensure_future -> isfuture/iscoroutine/isawaitable

We need C implementation for all those function to make gather really efficient 
for large scale application (e.g. Instagram)
Gather is really slow and cost ~2% CPU on our server.

The same optimization approach has been apply on other ciritcal asyncio 
modules, e.g. Future, get_event_loop, etc.

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<https://bugs.python.org/issue33521>
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