in reply to use File::Slurp for (!"speed");
There are other ways to measure "efficiency". For instance, I know the difference between $/ and $\, but I'm still prone to mistype one for the other perhaps as much as 1% of the time. The time it takes to identify and correct this is a huge inefficency; just using File::Slurp eliminates this problem, at least in the case of file slurping.