I think another problem here is that Maxima is called at all. It happens 
because the manifolds code naively compares two symbolic expressions via 
'='. This invokes the full equality proof machinery, which is probably not 
intended:

 
/home/rllozes/sage-8.0/local/lib/python2.7/site-packages/sage/manifolds/coord_func_symb.py(673)__eq__()
    671                 return bool(other._express == self._express)
    672         else:
--> 673             return bool(self._express == other)
    674 
    675     def __neg__(self):


Rather, the line should read:

return (self._express - other).is_trivial_zero()


Regards,

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