I use minimize_with * quite routinely (like, every time I prove something, 
usually). I haven't timed it with and without the discouraged tag on 4syl but 
that would be my benchmark.

This command is already pretty slow much of the time.

On June 14, 2019 7:06:03 AM PDT, 'Alexander van der Vekens' via Metamath 
<[email protected]> wrote:
>Why is the theorem ~ 4syl discouraged? The comment says:
>
>The use of this theorem is marked "discouraged" because it can cause
>the 
>> "minimize" command to have very long run times.  However, feel free
>to use 
>> "minimize 4syl /override" if you wish.  Remember to update the Travis
>
>> "discouraged" file if it gets used.
>>
>
>Actually, there are 191 uses of "4syl" in set.mm!  So is there (still)
>a 
>relevant impact on "minimize" or another reason why it is discouraged?
>
>In my opinion this theorem is quite useful and therefore should be
>usable 
>again (tag "(New usage is discouraged.)" should be removed). 
>
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