The evidence I've gathered about unix "find" vs. File::Find is at least a couple years old, and I haven't checked to see whether there has been an update to File::Find since then, nor tested it more recently to see whether it has improved within the last couple years. (I assume unix "find" remains about the same.)

In any case, I posted some benchmarks here and here. Looking at those again just now, my statement above about "5- or 6-to-1" should have simply been "5-to-1".