throw a little python shade

spec/src/introduction/index.tex

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 common tooling, features, and developer experience we have come to expect of
 modern languages, \Trilogy{} should be easy and enjoyable to work with.
 
+Additionally, performance must be passable; a language can't be considered
+practical if it takes too long to run a program. A very conservative minimum
+requirement is to be at least as fast as Python.
+
 Though it's likely that not every feature of \Trilogy{} will be used to its
 fullest, nor are some even a good idea to use to begin with, their existence
 will not get in the way of the usefulness of the language. Rather the opposite,