$ time ./python -m test.bisect --fail-env-changed -o bisect test_asyncio -N1
...
Bisection failed after 2 iterations and 0:00:11

real    0m10,441s
user    0m8,726s
sys     0m0,292s

There is good opportunity for optimizing the regular expression. All cases have the literal 'test.test_asyncio.' prefix, and even longer literal prefixes are common for tens cases.