RubyInt project, or Iron Ruby Based Mathos Core Library Interpreter was one of the projects to be tested with the new parser feature, that is, pre-scanned expressions.
In the Integral approximation module, it is quite good to use pre-scanned expressions, since the expression stays the same through the entire process. The execution time improved in this case.
The integral approximation website in Mathos Laboratory (see it here) has also shown good results thanks to this optimization. In Mathos Laboratory in particular, it is important that methods are quick and use as small amount of resources as possible, because it is hosted in the Cloud.
I have performed some quick tests using an i3 processor (the methods are in changeset 37964), although I would not recommend them to draw specific conclusions (there is a random error involved so more repetitions of each test are needed). Also, the difficulty level of an expression can affect the tokenization time. The graphs are located below:
One conclusion that can be drawn from this is that the optimization only gets useful when the same expression is evaluated more than 100-500 times.