I'm using a 5-point Triangle Moving Average:

Sj = (Yj-2 + 2Yj-1 + 3Yj + 2Yj+1 + Yj+2) / 9

The problem is that I often need to smooth my data more than once, and when I do this too much, it becomes noticeability very slow (and I'm using C++).

Is there a way to optimize this formula?

Like maybe skipping every other data point and then using interpolation in the end, or something clever?

Thanks

I'm using a 5-point Triangle Moving Average:

$$S_j = (Y_{j-2} + 2Y_{j-1} + 3Y_j + 2Y_{j+1} + Y_{j+2}) / 9$$

The problem is that I often need to smooth my data more than once, and when I do this too much, it becomes noticeability very slow (and I'm using C++).

Is there a way to optimize this formula?

Like maybe skipping every other data point and then using interpolation in the end, or something clever?

Thanks