Are you aware that clicking any of the quotelinks lead to the internal server error page?
This will make single links work:
https://textboard.org/prog/34#t34p98
Compared to what?
I have explained in detail how you are gratuitously replacing N operations with 2N operations by duplication, when this is easily avoided. I have also provided instructions that achieve this. If it is not clear to you how 2N is a performance downgrade from N, I am not sure how else to help you.
How did you measure it? I doubt parsing three digits is such a cardinal sin, but I am eager to see your numbers
If you will take a few minutes to read through the stress tests and the fix in detail, you will see that the entire point of the new vector-based posts-range is that on inputs that pass the regex from >>65 it "runs in zero time" as stated in the same post.