I was troubleshooting some specs which were the slowest of the slow (> 1s) so this threshold was useful for me on that branch. I think a threshold that singles-out only a few specs might be useful as we don't have a huge list of tests which are considered slow but we have a list of the worst offenders which we can target first.

I think on this branch there was only 1 that crossed that threshold so maybe we could drop it to 200ms and then if we manage to sort them out we can keep dropping it from there?