performance of Oper. transitive_closure

Hi,

I am wondering the performance of Oper.transitive_closure. 
I ran the function with a concrete-unlabeled graph (#vertex:2175, #edge: 13065) but it does not terminate even after 12 hours.
I have never treated such a large graph so I am curious that there is a better way to reduce the cost.

Thanks,
Kihong