How to calculate simple moving average faster in C#?

Question

What is the fastest library/algorithm for calculating simple moving average? I wrote my own, but it takes too long on 330 000 items decimal dataset.

• period /

Answer 1

Tested with Dotnet Core 3 & Linq:

int period = 20;
for(int k=0;data.Count()-period;k++){
   decimal summe = data.Skip(k).Take(period).Sum();
   summe /= (decimal)period;
}

It does rely on Linq and its internal optimization, did not time it.
Uses Skip() and Take() as a "rangeBetween" solution for moving average and then divide the summe by the period quantity.
*The for loop is upper capped to avoid incomplete sum operations.
Reference (C# Microsoft): Skip(), Take(), Sum();