Hello Nicholas, 

> After reading a file and getting 1 million lines' List, I need to
> make similar substitutions over matched lines ~500 times with this
> func:
> 
> 
> fun! foo#set_new_val(ressource) abort "{{{
> 
>   " position
>   let pos  = foo#getpos_ress(a:ressource)
>   let pres = foo#geth_presence(a:ressource)
>   let s:xml[pos] = substitute(s:xml[pos],'false\|true',pres,"")  <<<
>   HERE
> 
>   " Slave/Voie01 to Voie08
>   for idx in [1,2,3,4,5,6,7,8]       <<< HERE
>       let pos = foo#getpos_ress(a:ressource.'/bar0'.string(idx))
>       let s:xml[pos] = substitute(s:xml[pos],'false\|true',pres,"")    <<<
>       HERE
>   endfor
> 
> endfu"}}}
> 
> 
> 1/ Can I optimize this function ?

So far my experiments on the subject taught me that we are best avoiding :for 
and :while constructs when performances matter.
If you can use map() instead, do!

HTH,

-- 
Luc Hermitte

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