Note that your command is equivalent to
timeit('identity_matrix(1009).det()')
Things could of course always be faster; Though the different algorithms for
determinants of integral matrices seems to be similarly fast. The only thing
thats really a lot faster is computing with floating point numbers:
sage: timeit('identity_matrix(RDF,1009).det()')
5 loops, best of 3: 105 ms per loop
Though now you of course need to be careful about numerical errors.
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