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Rather than spending time on performance measurement, it is
best to focus on other goals.  Aim for the smallest amount
of code, the neatest output, greatest ease of use, and the
simplest way to change the output appearance.

The size of the docs is one metric of ease of use.  Ideally,
it would  take a paragraph or two to explain.

Also, write some sample code that produces a different
output appearance (XML for example).  How easy was it to do.

The goal is to focus the code into three parts:  the
underlying ndiff, converting ndiff to side-by-side, and
output formatting.