On Friday, 25 January 2013 18:44:56 UTC+8, Jeroen Demeyer wrote:
>
> I have determined that this is due to the GAP upgrade (#13211). 
>
> do you know where the regression is more precisely?
 

> On 2013-01-24 15:36, Jeroen Demeyer wrote: 
> > While testing for speed regressions due to #12313, I actually 
> > encountered a serious slowdown from sage-5.5 to sage-5.6: 
> > 
> > def test(): 
> >     for count in range(12): 
> >         for n in [2..20]: 
> >             for g in Gamma0(n).gamma_h_subgroups(): 
> >                 G = g.image_mod_n() 
> >                 assert G.order() == Gamma(n).index() / g.index() 
> > 
> > time test() 
> > 
> > 
> > The time for this went up from around 30s to 80s. 
> > 
>
>

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