Perl benchmarking with appropiate modules matmul and base64

You could use more comparable packages in terms of the backplane or the benchmark.

I would suggest MIME::Base64 instead of MIME::Base64::Perl (the pure Perl implementation).
I would also suggest to use PDL for the matmul.pl if you try to compare the matter for Python (NumPy) results.

MIME::Base64 is already used in the Perl tests (so, both libraries are being tested).