So it seems to come from the have_dot2tex() function, in that it tests the 
installation of dot2tex by executing a dot2tex command. I think the easiest 
and best solution would be to make have_dot2tex() into a @cached_function.

Best,
Travis


On Saturday, May 30, 2015 at 8:23:57 AM UTC-7, Jori Mäntysalo wrote:
>
> On Sat, 30 May 2015, Nathann Cohen wrote: 
>
> >> OK, so it's dot2tex (I guess). Somebody wants to test with it 
> installed? 
>
> > Having doc2tex turns a 100ms function into a 30s functions ? O_o 
>
> I tested this on 6.8beta1 on quite old and slow computer with 32-bit 
> kernel. In this machine the result after dot2tex was 
>
> An exception has occurred, use %tb to see the full traceback. 
> SystemExit: 1 
>
> I guess this relates to same bug somewhere. It worked fast without dot2tex 
> installed. 
>
> -- 
> Jori Mäntysalo 
>

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