Computing a determinant of a random matrix over a big finite field
became slower *by a factor 10* in sage-5.6.beta3:

def test(k):
    for count in range(20):
        d = random_matrix(k,50).det()

k = GF(next_prime(10^20))
time test(k)

sage-5.6.beta2:  2.6s
sage-5.6.beta3: 27.0s

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