The cost of memory declarations becomes very large after packaging

Development Platform & Builds
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1

I am making a plugin, and it works fine in PIE, but after packaging I noticed that it was very slow.

For example, if measure the execution time of the code below

for (unsigned int i = 0; i < 10000000; i++)
{
    TArray<TempStruct> test;
    test.SetNum(300);
}

it takes about 1 to 0.8 seconds in PIE.
But if test after packaging, it takes about 75 seconds

I also tested the computational speed, either the same or a bit faster in packaging.

int ArrayTemp[] = { 0,1,2,3,4,5,6,7,8,9 };
TArray test;
test.SetNum(300);
for (unsigned int i = 0; i < 10000000; i++)
{
    for (int list = 0; list < Test2.Num(); list++)
    {
        //Test[list].fVariable = 1;
        Test[list].fVariable = ArrayTemp[9] / ArrayTemp[8] / ArrayTemp[7] / ArrayTemp[6] / ArrayTemp[5] / ArrayTemp[4] / ArrayTemp[3] / ArrayTemp[2] / ArrayTemp[1];
    }
}

Both PIE and packaging came out in about 25 seconds, or 10% to 20% faster in packaging.

Why are these results coming out? And is there a solution?

I solved it temporarily by declaring all the variables to be used on the object.