>>> I'm curious to see if turning on optimisations actually makes any
>>> noticeable performance difference... I guess I'll find out tomorrow.
>>
>> Well, it depends on what those programs are actually doing. If they are
>> doing some heavy-duty calculations that take seconds or more, then there
>> usually is a quite drastic difference between using -O3 and not using it.
>
> How about if the program just calls two or three library functions that
> do all the work?
>
> Well anyway, I'll find out in just a minute...

Conclusion: -O3 = small but measurable performance increase.

(E.g., 27 seconds instead of 30 seconds.)

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