Exponential test time increase with more examples

[DanielVF]

I'm seeing exponential time increases when adding more examples to my scenario outline.

1x Example - 1.4 seconds
10x Examples - 22 seconds
20x Examples - 136 seconds
100x Examples - Well...

This is with a only a single feature file, containing only a single Scenario Outline. I have a table of 8 integer inputs and 4 integer outputs. I've tried replacing every single function in steps.py and terrain.py with pass, so that no code of my own is even being called, and it's just as slow (and in any case, my code is doing very fast, simple things).

Running a profile, it looks like it's spending 99.9% of its time in deepcopy copy.py:145 (Though I don't know if the profile is lying maybe the actual tests is running somewhere else)

[DanielVF]

I just ported my tests over to aloe and it ran them a bit faster...

Ran 90 tests in 0.086s

So it's not related to the code being testing - it appears lettuce specific.