I believe most of the time this would be used to time individual actions not compare the time spend in each action. Most would use benchmarking for that. This make the default sorting a bit unnatural. I would have preferred to see a chronological list as default (or at least available).
Also the labels "x -> y" may be useful but I believe "x" would have been less clutter.
I hope next version will have those as options or default. Still this is a practical module for adhoc timing without having to handle the boilerplate.