When hovering over a tooltip, we see something like:

Covered by 3 passing tests
Average execution time per test is 208ms
Total execution time for all tests is 624ms

Since the last line is just a simple function of the first two lines, it doesn't seem to me like it's that useful. Maybe replacing it with minimum execution time would be more useful. That way you can compare the minimum/average times to get an idea for the range of execution times, and better understand if slowness is something inherent to this section of code, or if it's heavily dependent on the kind of parameters passed in?

Just a small suggestion.

Thanks, as always, for an incredible tool!