Actually, I think that it's the .sage() call which is already taking a long time:

sage: M = MatrixSpace(ZZ,1000,5).random_element()
sage: %time res = M.__pari__().matsnf(1)
CPU times: user 68 ms, sys: 0 ns, total: 68 ms
Wall time: 68.7 ms
sage: %time v = res.sage()
CPU times: user 4.03 s, sys: 23 ms, total: 4.05 s
Wall time: 4.05 s

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