Improve parser generation time

[crummel]

Is your feature request related to a problem? Please describe.

To improve build times, @vzarytovskii suggested here that we may be able to improve the parser generation time by up to a minute.

Describe the solution you'd like

Source-build and I'm sure others would appreciate this being implemented, but it is a nice-to-have, not required.

Describe alternatives you've considered

N/A