On a Pi 4 - 
> 
>  (Time millisecondsToRun:[ 25 benchFib ]) > 200
>       or: [ (Time millisecondsToRun: [ 64 benchmark ]) > 200 ]

19mS & 143mS

I don't see an issue with possibly slowing down the first startup to test performance as long as
a) it isn't a multi-second delay
b) it says what it is doing
   "Checking system performance in order to provide advice on suitable setup options"
would be apropos.

tim
--
tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
Useful random insult:- Not all his dogs are barking.