What is the fastest way to merge two lists in python?

Question

Given,

list_1 = [1,2,3,4]
list_2 = [5,6,7,8]

What is the fastest way to achieve the following in python?

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Answer 1

list_1 + list_2 does it. Example -

>>> list_1 = [1,2,3,4]
>>> list_2 = [5,6,7,8]
>>> list_1 + list_2
[1, 2, 3, 4, 5, 6, 7, 8]