This seems like a bug to me:
sage: dd = {(0,0):1}
sage: %timeit matrix(8,dd).det()
10 loops, best of 3: 213 ms per loop
sage: %timeit matrix(8,dd,sparse = False).det()
100 loops, best of 3: 629 µs per loop
Should I open a ticket?
Cheers,
Jason
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