I agree this sounds like heavy processing on the Focus Group..
I START with just 2 people, then add their ancestors giving 247 people - all type of grandparents
then I add all their descendants, giving 1714 "relatives" - all types of cousins
Then I repeatedly add all their spouses, and their families - to find all the people related by 1 or more marriages, which is where I get 2500 through 3335 people (currently).
If anyone has a better way of doing this PLEASE suggest --- PLEASE
I say the Focus Group every 1 or 2 iterations and when TMG gives up I can pick up easily - it takes 8 iterations in the last stage to find everyone, and usually TMG "only" fails once.
I only do this once per month, just before re-generating our website, so for me this is not urgent.
I suggest the failure is caused by the window(s) which flash in the upper-right of the screen indicating the progress. Are they useful/required ?