CompactingTest takes too long to run

[timfox]

This is more like a stress test.

For our standard integration tests it should be much quicker. Can the number of iterations be reduced?

[clebert.suconic]

I had a bug once that only happened under stress and that was the minimal iterations.


but we seem to have forgotten the stress testsuite. I can make it fewer iterations, fine. But I will re-enable the StressTestSuite.