advice ...help ：Watchlist, array, execution speed

a question, I have an indicator on a watchlist that analyzes me the last x minutes of the trades executed and I do it through the instructions close [n]. The watchlist has 40 stocks. array and do the cycle on the array is faster? It seems to me a little slowed down and I don't understand what it is

Hello, fibdax,

Close [n] is an array (array of bars).
If you don’t use traces, don’t print data in files, it shouldn’t be slowed down.