[docs-infra] Fix light/dark mode & RTL change speed regression

[oliviertassinari]

Steps to reproduce

The light/dark mode and RTL toggle is today x4 slower than what good enough is at in production, and the RTL/LTR toggle in dev mode is x5-50 slower than what good enough is at. It used to be ok:

v4.12.4 - Dev: mode ~600ms, RTL: ~600ms, Prod: mode and RTL ~150ms

v5.0.6 - Dev: mode ~1,369ms, RTL, ~10,865ms, Prod: mode and RTL ~200ms

v6.1.8 - Dev: mode ~2,253ms, RTL ~ 59,761ms, Prod: mode and RTL ~800ms

Material UI doesn't feel like a credible option for developers with this performance.

Context

Same problem as #41117. Material UI is not usable like this, not truly. I mean, as a developer, this reinforces this story: I would only adopt Material UI for a new React project so that I can then contribute a fix to this. Otherwise, I wouldn't want to touch Material UI, there are better options out there nowadays, and it would only make sense to use the rich components of MUI anytime I can't find anything better.

Your environment

npx @mui/envinfo

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.

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