Serhiy Storchaka <> added the comment:

How often do you need to add three or more lists in comparison with other uses 
of the "+" operator?

How larger is the benefit of this optimization?

How much it slows down other uses of the "+" operator?

Would be nice if you provide some numbers.

More efficient way of concatenating several lists in single expression is:

    [*a, *b, *c, *d, ...]

nosy: +serhiy.storchaka

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