[ruby-core:42384] require vs require_relative benchmarks

I recently benchmarked require vs require_relative, and I was
surprised to see no noticeable difference between the two. This
doesn't make a whole lot of sense to me since relative require
shouldn't have to look anything up via RubyGems or the $LOAD_PATH, so
there should be some appreciable difference, even if relatively small.

So what am I missing? Is the implementation not optimized? Or is there
something that has to happen behind the scenes that voids any load
time gain? Or were my benchmarks anomalous for some reason?

Note: My benchmarks were simple timing how long it takes to load the
test-unit library, which has approx 20 or so files to load, vs the
same library with all the requires changed to relative requires. Both
averaged around 0.075 seconds.