Deserialization takes too much time

[wSemis]

Below are part of my code. It takes me about 30 seconds to deserialize pubilc key(pk) using bytesToObject(group,bytes) after I serialize it. In comparison, the serialization and python's pickle takes less than 1 ms. I wonder if there's an issue in the implementation of deserialization. If not, I don't think the speed of 30s is acceptable for any real life applications.

        g_array = [[], []]

        prev1 = g1
        prev2 = g2
        for i in range(2 * n):
            prev1 = prev1**eta
            prev2 = prev2**eta
            g_array[0].append(prev1)
            g_array[1].append(prev2)

        pk = {
            'n': n,
            'g1': g1,
            'g2': g2,
            'g1^a': g1**a,
            'g2^a': g2**a,
            'nu': nu,
            'E': E,
            'g_arr': g_array,
        }

[wSemis]

I found that deserialization for "SS512" takes 0.37 second for the same code. Mine was using "MNT224" previously.