Formula Challenge: The most efficient way to generate a Number Spiral (Ulam spiral) ?

Patrick2788  As I mentioned it wasn't optimized much at all.  So here is one slightly more optimized (almost 1/2 the time).  Basically I halfed the loops so I do 2 sides each time instead of only 1:

uSpiral2 = lambda(n, IF(n >4,
    LET(
        turns, INT(SQRT(n - 1)) - 1,
        s, SEQUENCE(turns,,2),
        all, REDUCE(
            {4,3; 1, 2},
            s,
            LAMBDA(p, q,
                let(mx, q*q,
                if(
                    iseven(q),
                    VSTACK(hstack(SEQUENCE(q, 1, mx + 1),p), SEQUENCE(1, q+1, q + mx+1)),
                    VSTACK(SEQUENCE(1, q+1, mx + 2*q + 1, -1), hstack(p, SEQUENCE(q,1, mx + q,-1)))
                ))
            )
        ),
        final, IF(all > n, "", all),
        final
    ),
    "Parameter 'n' must be >4"
));