I have attached two files to the issue. One of them (vanilla-vs-buffered) shows the mean memory profile of running test_asyncio 1000 times with the buffered GC and without the buffered GC. The other file shows the difference between both curves.

test_ascyncio is not a "production application" but is the longest and less specific test that we have. I have experimented with some tests in the pyperformance suite and they show some similitudes like some memory spikes seem to be smaller and less memory usage in flat regions after collections.