It always comes as a surprise to me how the same group of people who go out of their way to shave off the last milliseconds or microseconds in their tooling care so little about the performance of the code they ship to browsers.

Not to discredit OP's work of course.

People shaving off the last milliseconds or microseconds in their tooling aren't the same people shipping slow code to browsers. Say thanks to POs, PMs, stakeholders, etc.