>>> I think we could have both speed and correctness, at least for files 
>>> of this size.
>>
>> Feel free to enlarge long-line-threshold in your init file.
>
> Just a curious question: How did we arrive at the current value of 
> `long-line-threshold'?
>

I took the same value that Stefan had chosen for syntax-wholeline-max.

>
> I've been trying to follow the discussion but I don't think this has 
> been mentioned anywhere.  My apologies if I missed it.
>

No need to apologize, you're a careful reader 😃, it hasn't been mentioned 
indeed.