If i calculate the average of the time perl took divided by the time ruby took, i get this:
Which i understand to mean that perl on average took 7% longer.
However if i turn this around i get:
Which i interpret to mean that Ruby took, on average, 58% longer.
These things contradict and i made some mistake here. Can you clear up what i should've been doing?
The table you don't understand shows the median but you seem to be calculating the arithmetic mean.
Or even better: Try to explain in detail why on the overview page perl is claimed to be slower than Ruby, when in a direct comparison it is not.
Also, in addition, after reading your link, the situation seems even worse. Using the median Perl outperforms Ruby by ~15%, but the main site does not reflect that at all.