I need to know some properties of the perfect group of order $190080$
which is the Schur cover of the Mathieu group ${\rm M}_{12}$, but
when using PerfectGroup(190080),
GAP runs so slowly.
Is there any other method in GAP for getting this group?



Just write
in order to get the desired group as a permutation group:
Now computations should be fast. (If you omit the first argument, you get the group as a finitely presented group, and computations with such groups are inefficient for the obvious reasons.) 

