python3 tests run slowly #3
Description
it looks like the readline mocking for large data is pretty slow in the printer test in python3 (it was developed in python2)
a tool like line_profiler can be used to drill down on this
speeding up the tests would help things go faster in general
it looks like this relates to the threading implementation. i opened python/cpython#104391 regarding it. a possible solution would be changing Printer to use Queue instead of Event and Lock.